When bumbling lummox Wallace Ritchie threatens a visit to his successful, handsome, and socially mobile brother's posh London flat, the only thing to keep him out of trouble is the so-called "Theatre of Life," in which participants play a game of intrigue with hired actors masquerading as spies and hitmen. Unfortunately, Wallace inadvertently intercepts a phone call from real spies, who peg him for the gunman in their assassination plot--but Wallace himself is none the wiser.