Maybe it's because of his rich experience, or maybe it's because of his keen senses, Dover, Savi, and Katerina all think that this delivery boy is definitely not a killer.

He lacked a spirit, something special, it could be crazy, it could be calm, but he just didn't.

A dog won't eat mud that looks like, but it won't let go of that looks like mud, and it always has a way to tell the difference.

"Who told you to deliver the food?", even though Caterina knew that the young man was most likely just a food delivery, but the work had to be done.

She crouched in front of the young man and put the muzzle of her gun to his temple, "Think clearly before you answer!"

The young man's body was trembling slightly, he squeezed his eyes as if he was thinking, and after three or five seconds, he opened it and said the phone number of the restaurant where he worked, and the boss who asked him to deliver food.

The two agents who were carefully opening the take-out lunch box outside the house shook their heads at Katarina, the box was indeed food, not explosives, and after some simple test strip investigation, there were no toxic ingredients in the food.

While calling the investigation team to control the people in the restaurant and track down the person who placed the order, the other side did not let the young man go, but locked him in the kitchen.

Although it is not clear why the killer would send a food delivery man to alarm them, there must be a clear purpose for all this, and it is very likely that the killer who came to assassinate Durin is a veteran.

Keeping all the agents at their posts again, Caterina returned to the utility room door and knocked on the iron door, making a dull voice, "Are you still inside?"

"No, I'm not here!", some out-of-tune voices are full of strong confidence and optimism, and the dark enclosed space does not seem to make Durin feel any fear and oppression, and he is even interested in joking at this time!

Caterina has seen many ostensibly powerful people in the MIA, including spies trained from other countries, celebrities, and political celebrities.

These people don't need to use too many means, they just need to be locked in an enclosed space, which is enough to make them feel a deep fear, and even after a long time, some people will go crazy and go crazy.

This was not visible to Doolin, and the joking voice and emphasis disgusted her, because she realized that this was an abnormal person.

But it's not surprising when you think about it, after all, Durin has many titles, but if he had a little bit of normality, he wouldn't have gotten to this point - this is not a pejorative explanation.

There was a moment of silence inside and outside the door, and Caterina turned away and made her rounds of the villa.

It didn't take long for the agents outside to call back, and they found the restaurant, and also arrested and identified all the staff, along with the guests who were dining.

There are no very special people among these people, and after a friendly way of communication, there is nothing special to discover.

They have now been transferred to the local police station for detention, and special agents have been deployed to continue their interrogation.

Inside the restaurant, they found a sticky note discarded in a trash can with the time of the order, the content of the order, and the villa where Doolin currently lives.

According to the front desk of the restaurant, the person who called to order food was a man with a mellow voice, sounding about 30 to 40 years old, and he didn't speak quickly, but he pronounced the words very clearly.

After hanging up the phone, Caterina kept thinking about the fact that if the delivery person was just trying to attract their attention, then there was no need for it.

A little more means in the process of assassination will leave more flaws that may be left behind, and as a senior agent of the Military Intelligence Service, Caterina has been working on counterintelligence and counter-terrorism investigations within the Empire.

She was well aware that any superfluous action could be the key to solving the case, just like the message they got from the girl who answered the phone, which could already lock down the criminal's voice and approximate age.

This is not a good thing for the killer who is trying to hide himself, and he exposes some personal information.

But if this person is useless...... , Caterina felt that it was not quite right, this young man who delivered food would inevitably play a role in this assassination, but she never understood what he was for.

Let it go, that's impossible, he hasn't completely cleared his suspicion, and the only thing he can do now is to temporarily detain him in the villa and wait until tomorrow dawn to make plans.

"Cheer up, pay attention to your post, and call for support immediately if there is any situation!", Caterina instructed several times, and began to walk around the villa, not missing a single place.

Time passed like this, as if the assassination of the killer was just a misjudgment of their guesswork, or that the killer had already chosen to leave when he saw the strict security measures here.

Caterina was a little agitated, the more calm she was, the more she felt a sense of urgency, as if a killer could appear in this villa anytime and anywhere.

At about two o'clock in the evening, there was an almost inaudible sound from the closed window in the kitchen, and in the gap of less than a millimeter between the window and the window sill, a wire quietly penetrated in, this wire was at a ninety degree angle, and after most of it penetrated in, the horizontal right-angle wire slowly turned.

Part of it slowly rose upwards and was already against the latch of the window.

The movement of the shadows blurred to the point of almost invisible outside the house was quite slight and patient.

Just a little bit, little by little, the latch was silently opened, and then a gust of wind stirred the curtains, and outside the window, which was less than thirty-five centimeters long and wide, something squeezed in.

The curtain quilt was deformed, and a pair of feet had fallen on the cupboard.

The next second, a smooth head appeared behind the curtain, and he jumped down as dexterously as a cat, without making a sound.

The takeaway guy who was locked up in the kitchen was sleeping on the bar, he walked over lightly, stood behind the guy like a ghost, and his left hand passed through the gap between his arms and neck, and then slammed back!

At the same time, his right hand pressed his head, and with a slight twist, the takeaway guy didn't make a sound, and the power of resistance disappeared.

He quickly stripped off the takeaway guy's clothes, stuffed him into the cabinet under the cupboard for the utensils, then changed into the guy's clothes, put on a yellow hard hat, and lay down where the guy was sleeping just now.

At this time, he silently counted in his heart.

Ten......

Nine......

Eight......

......

Three......

Two......

One......!

There was a loud bang, and the boiler in the basement of the villa suddenly exploded violently, and if there were professionals on the scene, they would definitely be able to tell others at the first time that it must be caused by the high internal pressure of the boiler.

That's right, the wrench comes in handy!

After two days of careful observation and planning, he even went to buy the same boiler to try, and he had figured out how long it would take for the boiler to explode when the pressure could not be relieved, and then he completely shut down the pressure vent located outside the villa.

The sound of the explosion alarmed all the agents in the entire villa, including Durin's people.

By the time Caterina and Dover burst into the basement, one of the agents on duty had collapsed in a pool of blood.

The exploding boiler was like a huge bomb, and there was no chance that anyone who approached it would have any chance of survival.

Dover stepped forward, ignoring the steam and boiling water, and checked the vents and water intakes, and there was no damage, and Caterina watched from behind him.

The two of them ran upstairs almost at the same time, and if it wasn't an accident, then it must have been an accident created to get their attention!

It's just that they didn't notice that next door to the boiler room is the villa's constant temperature system, and the constant temperature system and the boiler are actually connected together.

In the summer, it may not be needed, but in the winter, the thermostat system sends steam and hot water to the entire building through the water circulation system buried in the walls and floors, so that the temperature throughout the villa is kept at a suitable temperature.

In the summer, these are not needed to heat the entire villa, so one of the inlet valves in the circulation system is closed.

At this time, the boiler has completely exploded, the water outlet of the water circulation system and the water outlet of the boiler are connected together, and the water distributed in the various pipes of the villa in the entire water circulation system is losing rapidly.

After the loss of this ice water, the temperature in the villa began to rise significantly, and it was dark at this time, and the people in the house could not see at all, nor could they notice that there were some small things of different sizes and shapes on the walls and eaves outside the villa.

The places where these things exist all have one characteristic - they are all located in the vents of the ventilation system.

Because the villa in Dolin is much larger than the average villa, some rooms in the house cannot be directly connected to the outside world, so the ventilation system needs to be ventilated regularly.

At this time, the temperature in the room was rising, and the wind that blew out during the exchange was no longer cool, and suddenly something the size of a fist hanging under the vent emitted some white smoke, and then the smoke became thicker and thicker, and these thick smoke were swept into the vent during the ventilation!

Caterina, who was guarding the first floor of the villa, searched several times and found nothing, but at this moment, she and the others suddenly coughed a few times, and then they were horrified to find that some white smoke began to spew out from the cracks in the doors of some rooms.

Caterina's face turned dark, they were here to protect Durin from assassination, not to fight against biological weapons, who would wear a gas mask at this time?

The thought that the killer would most likely enter the empty villa after they left made it possible for Caterina to weigh it up.

It was to leave with Durin to avoid a one-on-one situation between him and the Assassins.

Or let Durin stay in the safe house and wait for rescue.

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