The episode sees Del Boy, Rodney and Grandad travelling to Boycie's weekend cottage in Cornwall intending to do some illegal fishing.
He also warns them that a convicted axe-murderer has taken advantage of the power cut and escaped from a local psychiatric hospital, where he was imprisoned for having killed a group of fishermen exactly ten years earlier.
Eventually they are interrupted by a man calling at the door, whom they allow in when he introduces himself as Chief Robinson, the head of security from the institution, and shows them his identification documents.
The escaped patient had attacked him, knocked him unconscious and stolen his uniform and ID documents, meaning Del is alone in the cottage with the real axe-murderer.
Del seizes on the murderer's aversion to winning by proposing they play for money, and the episode ends with the pair beginning their game.