After the two returned to the mansion, sure enough, Nangong Feng was really standing and waiting at the gate of the mansion, but it was not only Nangong Feng who was waiting for the two of them to come back at the door, even Nangong Tian, Nangong Hai and Nangong Yun, of course, and Xiaoyue and the others stood at the door and waited quietly. The carriage stopped at the door of the mansion, and when Wei Yongnian saw so many people standing at the door, he hurriedly got off the carriage, and ran quickly to the other side of the carriage, helping the tired Nangong Xue to get down from the driver's seat of the carriage.

Wei Yong said in Nangong Xue's ear in a young voice: "Xiaoxue, wake up, the old man and a large group of people are standing at the door waiting for you, if you are sleepy, let's take a look at them first, and then go back to sleep, okay?" "It's no wonder that from morning to night, Nangong Xue is almost like clockwork, this time it's already the hour, it's not sleepy, even if you are hungry, you can't resist the sleepiness caused by fatigue. So much so that Nangong Xue fell asleep tired on this road. If it weren't for Wei Yongnian sitting next to him and supporting him, I am afraid that Nangong Xue would be in the hard carriage and sleeping in pain while jolting.

After being woken up by Wei Yongnian so softly, Nangong Xue still couldn't resist the sleepiness, her loose eyelids kept blinking, and then Wei Yongnian walked to Nangong Tian and them with the help of Wei Yongnian, Wei Yongnian said: "Back to the old man, Xiaoxue is tired and asleep, ...... you look at it?" ”

As she was saying, Nangong Xue tried hard to support her eyelids, which were not under her control for the time being, and yawned sleepily and said, "Hello, everyone is here?" It's neat enough, don't stand here at such a late hour, haha, don't catch a cold again, it's time for the wind to get cold...... After speaking, Nangong Xue's eyelids stubbornly closed again. Immediately, Nangong Xue snorted softly.

Seeing Nangong Xue so sleepy, Nangong Feng, who was anxious and worried, no longer wanted to reprimand Nangong Xue, Nangong Tian said to Xiaoyue: "Xiaoyue help Xiaoxue go back to the room to rest, by the way, you can prepare a bowl of ginger soup for her, she has only come back since she went out in the morning, and it is cold again at night, don't catch a cold anymore, if she wakes up in the middle of the night, let her drink a bowl of ginger soup to warm her up and continue to sleep." This child, the older he gets, the more he can't control it. ”

Nangong Tian looked at Nangong Xue like this, and said with a long sigh: "Forget it, it's okay to come back safely." What else to say? Hai'er Yun'er, you two should take care of her more when you are brothers, there are some things she doesn't understand, so you can teach her more, do you hear? ”

Nangong Hai nodded with Nangong Yun and replied, "It's grandpa, we know." After speaking, Nangong Tian said lightly: "Let's go back and rest, but Yongnian, you go to the study in a while, I have something to ask you." Wei Yongnian replied respectfully: "It's the old man." Wei Yongnian drove the carriage into the mansion from the back door into the mansion, separated the carriage from the horse, and then led the horse back to the stable, after feeding the grain, gently stroked the horse's head, and said: "Old man, you have worked hard for the past two days." Eat well, and rest when you're full. After speaking, the horse seemed to understand what Wei Yongnian said, so he rubbed Wei Yongnian's chest with his head, and snorted twice, Wei Yongnian also understood what the horse meant, smiled and stroked the horse's head a few times, and said softly: "Okay, it's not early, I'm leaving, you can rest." Then he turned and left the stable.

After leaving the stable, Wei Yongnian went straight back to his room Jane, washed up alone, and then changed into clean clothes, and then went to Nangong Tian's study.

As soon as he entered the door, Wei Yongnian saw Nangong Tian sitting on a recliner and shaking and looking at the book in his hand. Wei Yongnian saluted respectfully and said, "Yongnian has greeted the old man." As soon as the words fell, Nangong Tian said amiably: "Yongnian, come and sit and reply." After Wei Yongnian got Nangong Tian's permission, he sat next to Nangong Tian.

After seeing Wei Yongnian sit down, Nangong Tian smiled slightly and said, "Yongnian is here for you, you don't have to be so restrained, how can you do it to me on the Feng'er side, understand?" Yongnian ran with Xiaoxue for a day today, what is the situation on Xiaoxue's side? Is it strict? ”

"Hmm." Wei Yongnian thought for a moment and continued to reply, "That's the ....... Wei Yongnian told Nangong Tian in detail about the events of this day. As soon as Nangong Tian heard that this time was related to **** salt poisoning, he frowned and thought for a long time, and then said, "Okay, I know,......。 Just as he said this, Nangong Tian saw Wei Yongnian holding back his yawn and didn't dare to fight, so he continued slightly, "...... It's late, so let's talk about it today, so go back to the house and rest. If you have anything to say, I'll talk about it tomorrow. After speaking, Wei Yongnian respectfully bowed to Nangong Tian and retreated. Only Nangong Tian was left alone in the study.

Nangong Tian sat silently on the recliner and kept chanting in his heart: "**** salt poisoning? Salt poisoning? Salt......? Well?! Thinking about what suddenly came to mind, he stood up suddenly, lit the lantern at the door, extinguished the wind lamp in the study, and then carried the lantern to the library in the back garden.

As soon as he arrived at the library, Nangong Tian took out the fire pleats to light up the wind lamp in the library, and then extinguished the lantern, and began to take the wind lamp and look for the books he wanted in front of the bookshelf, and after a while, Nangong Tian took down a stack of books from the bookshelf, these books are very old from the cover, and a lot of dust has fallen on the cover, but even so, the title of the book can still be vaguely seen through the dust, and the dust is still counted, and some of the covers are a little damaged from the edges. Fortunately, it can be preserved, at least the whole is still complete.

So Nangong Tian didn't bother to move the books to the table and sat on the chair to read them, so he just sat on the spot and looked at these books. In the dark and silent night, when the third watch had passed outside, Nangong Feng couldn't sleep anymore, so he put on a dress and walked to the corridor, raised his head and looked at the sky with only the moon, because Nangong Feng's position was just opposite the library building, just when he looked up at the moon, he noticed that there was a bright light in the library building, and said secretly in his heart: "Why does my father go to the library without sleeping at night?" So while thinking, he hurried into the house and got a cloak, and then grabbed the door and walked briskly to the study.

Not to mention that Nangong Tian was so fascinated by reading books that he didn't know when Nangong Feng came, or he was concentrating on books, Nangong Feng saw that his father was so focused and it was not good to bother, so he only gently draped the cloak he brought on Nangong Tian's body. Then he also sat next to Nangong Tian, and looked at Nangong Tian quietly.

After a while, Nangong Tian may have seen that his neck and waist were a little sore, so he put down the book in his hand and stretched his waist slightly, and at this moment he saw that Nangong Feng was already sitting next to him, so he said lightly: "Feng'er, you are here, and you will not say a word when you come." ”

Nangong Feng replied with concern: "It's been a while, because I was afraid of disturbing you because I was so focused on reading for fear of disturbing you, so I didn't disturb you." As he spoke, he lightly pointed to the books in this place, and continued, "Dad, what are you looking for when you come to the library to look through these old books without sleep in the middle of the night?" Do you want me to help you find it? ”

"That's just right." When Nangong Tian heard this, he nodded and replied in a loud voice, "You can also come and help me check the relevant records about **** salt." ”

"**** salt?" Nangong Feng didn't understand a little, this word seemed extremely fresh and unfamiliar to him, and the first time he heard it, he asked rhetorically, "What is that?" Haven't heard of it? Daddy, what are you looking for this record waist for? ”

"You look through these old books first, and you explain to you while you look for me." Nangong Tian explained slowly, Nangong Feng picked up an old book and checked it as instructed, he listened to Nangong Tian's narration while checking it, "After Yongnian came back this evening, I asked him about Xiaoxue, and he told me that it was not in vain to work hard all day today, and finally after some diagnosis, he heard the thirteen princes mention a thing, that is, **** salt, and those in Nancheng who sued Xiaoxue for poisoning their restaurant were all because of this **** Salt and one by one fell into bed and couldn't afford to be sick, of course, I don't know how the thirteen princes knew about this **** salt, and the reason why I heard it familiar is because I once seemed to have seen it in that book, this **** salt is a poison, from the appearance you don't seem to think it's poison, but if you take a large amount of it, it won't take a few days and there will be no cure, but if the measurement is small, it will be a chronic poison, which will slowly erode the internal organs in the body little by little, But after a long time, it will also be a life, so it depends on whether it is time to rescue. In the memory of my ancestors, this **** salt is not a thing of our Xuanwu Empire. In other words, it should be brought from the 'outside'. Speaking of this, Nangong Tian paused slightly.

That's why you don't sleep most of the night and come here to read books, right? Father. Nangong Tian took over the conversation and said.

"That's right." Nangong Tian nodded and continued, "In my impression, this **** salt doesn't seem to be a thing of the previous dynasty, I once flipped through a book a long time ago, and those extremely rare things were recorded in detail in the book, but unfortunately I was just curious when I looked at it at the time, and I didn't take it to heart at all, so I didn't write the title of the book in my mind at all." Hey, now that I'm old, my brain is even more useless, I don't remember the title of the book, and I don't even remember what the book looks like and put it there. ”

“……。” Nangong Feng was silent for a moment when he heard this, and then said comfortingly, "Dad, since you know that there are records in the books, don't be too pessimistic, I will help you find it together, I will definitely find it, don't dare to say anything else, the books in our book building are almost comparable to the Hanbo Building in the capital." As long as you are sure that the book is still there, then you will definitely find it, don't worry. Find it slowly, I'll help you. ”

Saying that, the father and son began to look for the old book that recorded **** salt in the entire library.