CODE

Chapter 7 - SILENT KILLER

I started to find any evidence possible in and around the car...

He didn't even attend the farewell bro... The last time I met him was the day he came and asked for the acid in the Chemical lab... Vivian said looking at Rohan's body

Chemical lab??? When did he ask for the acid? What for? Sai asked in curiosity

Two days before the farewell day...He wanted to clean some rust in his car wheel, so he asked for the Hydrofluoric acid... Vivian said

Hydrofluoric acid??Bro... it's really harmful...Why you gave him?? Sai questioned

No bro, the acid was just medium concentrated one so not too much harmful... And it's Rohan... So, I gave him without the professor's knowledge... Vivian replied

Anyone had noticed??? Sai asked

I don't think anyone had noticed... Vivian replied

If something had happened, you would have been screwed since you the responsible person for the chemical lab... Sai said in concerned tone

Bro our college days are over anyways... Do you think someone will come and question now?? Just leave it, Vivian said without bothering much

Rohan's father had arrived at the spot...

*As soon as he reached, the body was taken to his house for the condolence in the ambulance and car was left at the same place to be picked up by the truck...

*The crowd was almost cleared...

It's unbelievable that Rohan met with an accident... Sai said in a lowered tone

It's not an ACCIDENT... It's a PLANNED MURDER... Finally, I revealed to Vivian and sai

What the hell??? How is that possible??? Vivian asked and looked curious

Do you guys remember the Codes that we cracked?? It's VENGEANCE,20/06/2019, MAHABALIPURAM and one Unsolved code... I said

But how these all related to Rohan?? Sai asked cluelessly

The Final and unsolved code is what actually related to Rohan... I said in confidence

Look at the Code...

It's IRISH-Y4A1N60T84...

Last four digit of Rohan's car number is 4068... By solving this code, the number will be TN14AY4068...

You told me that it looks like a vehicle number so we will solve this one first, but I refused because it will take 10! possibilities... But, it's not 10!... If we're smart enough, we would have found that (TN) remains constant because all the given codes and places are in Tamilnadu... And remaining letters would have been either AY or YA... Then we would have ended up with possible Chennai RTO numbers that are 01,04,06,08,14... So somehow, we would have arrived at exact Rohan's car number...We were not smart enough... I said

*Both Vivian and sai were stunned by the explanation

But... What is that irii...iriii... Irish means ???

If we would have found the exact car number and checked in RTO details, it would have shown the name "Ravichandran" ... Since the car is registered in his father's name... So here is where the word IRISH would have helped us...

Rohan is an Irish name... I remember him saying this to me during the Kerala trip... So, we would have found that It's not Rohan's father"; it's Rohan who is going to be killed…

So, it's a PLANNED MURDER... The person who had sent the message to us is the Killer...

But how can anyone be killed in a running car without any evidence?? Vivian asked curiously

It's not someone... It's Something... I said

Whattttt?Something??? Sai asked

Yaaaa, we know Carbon Monoxide comes out when the fuel burns...And most importantly Carbon Monoxide is colorless, odorless and tasteless... It's even lesser dense than air... So, when you inhale Carbon monoxide you won't be aware that you are inhaling something which harmful to your body... But when it exceeds 70ppm, you will start getting c.h.e.s.t pain, nausea, and dizziness...

It's one of the reasons why cars have exhaust... If the exhaust is blocked or leaked, then the Carbon monoxide will come inside the car... Passengers will inhale it without their knowledge and once it exceeds the limit, they may even die...

That's why Carbon Monoxide is called as a SILENT KILLER

But if the exhaust is blocked, the car won't even start right?? Sai asked

That's where the killer played smartly... I replied and took them near the car

Look at the exhaust...Only Some amount of debris has been kept inside... So that not all the Carbon monoxide will go out, only 30% will go out and the remaining 70% will go inside the car because of the block... I explained

*Both were stunned once again...

But how come Rohan managed to reach till Mahabalipuram then??? Vivian asked

That's the reason for keeping just some amount of debris...

If my guess is correct, the Carbon monoxide that went inside would have had 60ppm maybe... Rohan started from Shollinganallur so with the usual traffic, it will take 30 minutes to reach MAHABALIPURAM... For those 30 minutes, he must be inhaling the Carbon monoxide with 60 ppm limit... After that, he must have got the c.h.e.s.t pain or dizziness due to which he just lost the control of driving and met with an accident... I explained

The Killer is smart enough to keep the Carbon monoxide limit at 60ppm, to know how long it will take to get the c.h.e.s.t pain or dizziness if the level is at 60, and how much distance Rohan will cover with usual traffic... He calculated everything perfectly and executed this... I added

The worst part is, the autopsy report will say that Rohan has consumed Carbon monoxide... The police may find out the debris in the exhaust... But they will never know that it's a planned one

Only We three know that it's not an ACCIDENT... It's a PERFECTLY PLANNED AND EXECUTED MURDER...

The killer is brilliant enough to give a tougher set of codes at the same time he is exceptional in Chemistry too...He is a genius… He is not just what we think... He is a Giant... I said and looked at both of their faces

*Vivan and Sai went numb...

*It was almost 7 pm in the evening

Whyyyyyyyyyyy the hell he dragged us in this crap??? What the hell he wants??? Sai shouted in frustration

*Rudra's phone beeps

*All of them froze

Message came from an unknown number

* Opened the message...

Three of them almost became a statue

The message reads as

Well played, KID

BETTER LUCK NEXT TIME...

Tik...Tik...Tik...