Jack in a Locked Room ✔

It was a perfect crime, until the deceased emailed the detective to, 'have fun.'

***

Jack died in a locked room. There was a CCTV footage at the hallway Jack was staying in. Room 305, an anonymous person entered Jack's room, after an hour, someone using Jack's phone called the land lord to pick up the phone's owner.

It was then discovered that Jack was killed, and the case remain unsolved until the dead sent an email to the detective who had been avoiding Jack's case.

"Have fun? Why? Are you having fun down there?"

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