An apartment building on the Upper East Side in Manhattan, New York, USA

You have to say that when John Leto is sober-minded, he definitely belongs to the thoughtful Lord, even if he was down-and-out before, at this moment, under the stimulation of the high prize of 10,000 dollars and the business opportunities that seem to be within reach in the future, this guy who has passed the first level of the assessment is very blessed, and at this moment he made up his mind to start with the $100 paper in his hand and the American historical figure Benjamin Franklin on the banknote, which frowned and walked back and forth in the long corridor, I chose the one with the number 1706 on the door.

Benjamin Franklin, the big man on the $100 banknote, was born on January 17, 1706, and died on April 17, 1790, just now John Leto, the former senior tax commissioner of the IRS, did not find the room with the number 1790 in the corridor, but the room with the number 1706 was quietly at the end of the corridor as if waiting for the lucky one to break in, John Leto carefully looked at the door of the room 1706, and there was not much difference from the other closed doors on both sides, They are installed with a numeric keypad door lock that is also a valuable one in this era, and the 12 keys of 0-9 plus * and # can normally enter countless combinations of door opening codes.

John Leto took a deep breath, first typed 1790 and then pressed the # key to confirm, this is the year of Benjamin Franklin's death, and it is also the number that is most likely to become a password, in fact, the password of most digital locks is set between 4-8 digits, but luck is obviously not on John Leto's side, after pressing the # key, the combination lock sounded Didi's alarm, showing that the password is invalid, and then the corridor fell silent again, fortunately, there was no sign of a similar combination lock that could not continue to enter because of the wrong password......

"Not 1790? Or, is the password more than 4 digits? John Leto held his chin and thought for a while, he continued to type a second time, "17900417", these eight digits are the year and date of Benjamin Franklin's death, his fingers trembled slightly when he typed, but the reaction of the electronic door lock made him extremely frustrated, just like the first time, when he pressed the # key to confirm, the door lock still sounded two beeps that were obviously the wrong password input......

"It's only three ......" John Leto sweated on his forehead, in most cases, this kind of high-end electronic door lock on the market, will limit the number of times to enter the wrong password, such as three times, or 5 times, the purpose of this design is to avoid being used to traverse and repeatedly enter the way to blind the password, now he has entered the wrong twice, victory seems to be close at hand, and it seems to be far away, "Hell! What the hell is the password?! John Leto cursed and spun around......

"Or? Is it today's date? Another hope and thought came to the heart of the former IRS veteran officer, "Today is Wednesday, March 31, 1993...... So, give it a try 19930331? Thinking of doing it, John Leto, who had come this far, felt that he had no way back, he had already observed just now, the elevator that sent him up had no button at all on the door of this corridor, that is, he could only get out of the elevator, and after the elevator door closed, he could no longer call the elevator to leave from here......

The door of the corridor at the end of the fire staircase is locked, and if you can't find a target in this mysterious and quiet long corridor, you may be trapped here if you can't do anything??? "Hey!! Is anyone there? Can you hear me?!! John Leto shouted out in the hallway by surprise, he felt like he had to try anything else before entering the password for the third time, it was a bit like a brain teaser or a brain teaser, maybe he didn't need to enter the password at all, he didn't have to enter any room, but just, find a way out of here?

There was a muffled echo in the hallway, and then there was silence again, not a single door opened, and no footsteps were heard, John Leto felt like a dying puppet or a trapped beast manipulated by the mysterious hand of the invisible, and couldn't find a way out at all, didn't he need to open any of the doors, but just find a way out of this long hallway??

John Leto temporarily gave up the idea of continuing to enter the unlocking code in front of the door 1706, and re-followed the corridor to the end of the fire staircase, which is also a small return hallway, with a long corridor at one end, and a closed fire door at the other end, which should have been closed but not locked, and at this moment an electronic password lock was added, it seems that the planner behind the recruitment has put a lot of thought into it this time, this apartment does not know if it was originally someone's property, or temporarily rented just for... … What mysterious project investigations and operations are recruited to recruit private investigators?

In the private detective market in the United States, sometimes the small target is only a few hundred dollars in labor fees, and thousands of dollars are even worth doing an errand, as for tens of thousands of dollars in cases, for a small-scale one-person detective agency like John Leto, it is almost a big pie smashed to the top of the head, and it is absolutely impossible to give up or pass by, not to mention, the reward for the other party's recruitment assessment is as high as 10,000 US dollars, once it is hired, the real acceptance of the case must be at least tens of thousands or even hundreds of thousands of dollars, right?

The first level of $20 is nothing, and the second level of $100 is a welcome gift for the former senior IRS officer to see the hope of getting a $10,000 meeting gift, this is a mental game, if this opportunity is missed, John Leto estimates that most of them will be reduced to the streets and become homeless, in Brooklyn $500 per month rent single apartment and snail rent rent has been in arrears for 2 months, today is the last day of March, to tomorrow, even if it is an April Fool's Day holiday, John Leto can't guarantee that the fat landlord won't throw himself out into the street!

"Could it be that just by opening the electronic lock on the fire staircase, you will pass this damn second test?!" The more John Leto thought about it, the more likely it became, Metersbonwe's advertising slogan was unusual, the brain teaser game was not the same as the newspaper crossword puzzle, and he had to find another way to start from an inconspicuous place, and this product took out the $100 paper bill in his hand and looked at it again and again, and decided to try his luck on the electronic lock leading to the fire staircase!

"1706#" John Leto held his breath and entered Benjamin Franklin's birth year on the keyboard, bad luck, the electronic lock emitted a Didi error prompt, obviously wrong, then, "17061790#" John Leto muttered his fingers trembling slightly and entered the year of Franklin's birth and death A total of eight numbers, in his opinion, the $100 paper note should definitely be the key to open the door to victory, However, the god of luck was clearly farther away from John Leto than he thought in the second level.

After the 8-digit code was entered, the electronic lock was still a short Didi two times to indicate that the code was entered incorrectly, and John Leto's previous hope now turned into frustration, he held up the $100 bill in his hand and looked at it carefully, muttering to himself if he was thinking too much? The password should not be the year of Benjamin Franklin's birth and death, but ...... It's the serial number on the banknote - the bill?? “EF31312567BF03？ How do I guess this Nima? Just enter 313256703? A 9-digit code to open the door? ”

John Leto fell into the trap again, he didn't dare to try the third chance to enter the password, once the error, but no one guaranteed that the electronic combination lock can allow more than three errors, hope can not be pinned on luck, to use their own brains to think about it, to calm down to observe the surrounding qiē, the reason why the puzzle has become a puzzle, must be with the help of the blind spot of the mind or, the blind spot of the line of sight...... Who says you have to open that door to the fire staircase to leave?

The former senior tax commissioner of the IRS turned his gaze to the top of the corridor, apparently above the corridor is a ceiling and partition similar to the corridor of a hotel room, and every 5 meters or so is an air conditioning vent, "Can't you leave here through the air conditioning ventilation duct?" Why not? How do you know if you can't do it without trying? The guy who came up with the problem must be a super pervert, so many electronic locks may be a trick to bluff people?! John Leto felt as if his mind was much clearer than it had just been......

If you want to leave from the air conditioning ventilation duct 2.35 meters above your head, the first step is to find a vent to open the style grille and climb up, John Leto's height is 178 cm, as a former volleyball player at Columbia University's College of Arts and Sciences, 20 years ago, his bounce and physical fitness were good, if you want to jump up and touch the height, 2.35 meters This height is not difficult, but now is not 20 years ago, 43-year-old alcoholism and indulgence John Leto, who betrayed his relatives and left his family. Physical fitness and physical elements are not the same as in the past......

Jumping up on the spot and trying a few times, John Leto's fingers will reach the edge of the air conditioning ventilation grille above his head, even if he can jump 3 centimeters high, he may be able to grab the grille, of course, the thin air conditioning grille may not be able to support John Leto's 150 pound weight, but being able to pull the grille down was originally the first step of the plan, and after the air conditioning vent was exposed, it was time to think about how to pull up or climb up, John Leto felt as if he had returned to his youth, and his chest was burning with fighting spirit!

To say, although John Leto was a private investigator as a last resort, but in his fifteen-year career as a tax investigator at the IRS, he did a lot of rough stuff like stalking and stalking and climbing walls and windows......