A retired man attended a class reunion and mysteriously disappeared on his way home after the party.
The mother who lived alone made her last phone call with her daughter and then disappeared from home.
A middle-aged businessman watched his friend leave at the door of the hotel, but he didn't know that he was about to be involved in an extremely strange incident.
All these seem unrelated, but there is a pair of invisible hands controlling them behind the scenes...
Purpose: Decryption