Murder In The Lift

Piyush, a disco owner found murdered in a lift, but there is no wound on his body or evidence for a cause of death. On top of that driver on the ground floor did not see the lift stopping at any level or see anyone getting in or out of it. The team start their investigation and check every corner of lift but cannot find any possible way this murder could have happened. Sudesh, a partner of the casino is a suspect but he is also missing. How will the team solve this case with a complete lack of clues to work off?