The killer entered and left through the service elevator between 9:15 PM and 9:48 PM. Start by ruling out suspects who can prove where they were during that window. Who has a solid alibi — and who doesn't?

A car was caught on the parking camera. Look at the make and the partial number plate. Now check the bank statements — monthly car-loan EMIs can tell you who owns what kind of vehicle.

The killer had a spare key to the apartment. One suspect mentions this early in their statement — but then leaves themselves out when the police directly ask "who else has a key?" Read Karthik Nair's interrogation again, carefully.

The autopsy found two injections at the same spot on Arjun's left elbow — one a normal vitamin shot, the other the one that killed him. Who gave the first injection, and what does that tell you about who set up the second?

Look at the bank statements. There's a company name that shows up in two different people's accounts — money going out of one and coming into the other. The amounts match. The dates are just days apart. Find that company.

The insurance policy has a doctor's name on it — but it's shortened. Check the registration number against other documents in the case. The same person who signed off on the insurance upgrade also had access to the substance that killed Arjun.

Think in three categories: money, medicine, and messages. One piece of evidence shows a financial link between the killer and the accomplice. One shows who had access to the substance used. One shows them coordinating on the night it happened.

Money: follow the Sunrise Wellness Solutions trail across both bank statements — notice the amounts and dates.
Medicine: check the pharmacy order form and see who requested the substance that matches the autopsy findings.
Messages: both suspects deleted texts from burner phones on the morning the body was found.

The three strongest pieces:

1. Sunrise Wellness Solutions — Karthik sends money INTO this company, and the accomplice receives money FROM it. Same amounts, with a 3-day gap each time.
2. The pharmacy order form — concentrated potassium chloride was requested on March 10 — the same substance that killed Arjun. Look at who signed that form.
3. Deleted text conversations — both suspects had texts with unknown numbers, both about "Sunday", both wiped on the morning the body was found. And the phone records show a call between the two suspects on March 13 at 10:22 PM — the same night one of those deleted conversations happened.

Something was coming the following week that would have been very dangerous for the killer. Look at the emails in Arjun's inbox — one of them has a date that changes everything.

A financial audit was about to happen. Find the email from the auditor and check the date. Then ask yourself: what would that audit have uncovered?

The audit was scheduled for Monday, March 17. The auditor asked for full access to all bank accounts and management fees — with statements ready by March 15. If Arjun was still alive, the money problems would have been exposed. Compare what the killer told police about the finances against what the actual bank records show. The numbers don't match — and the audit would have proved it.