The Long Chase

John Corby is birdwatching with his father Tom. Susan Fraser has found herself cut off from land so John helps her. Reaching land, she gives him a note to explain his absence to his father. However, nobody seems to know where Tom has gone.

John and Susan seek police help to look for Tom. The police won't intervene, as Tom Corby is suspended from Scotland Yard. Tom and his two contacts meet up with Kessler. Police surveillance believe Corby is on the take.

John and Susan catch sight of Tom but are unaware that a hitman is assigned to stop them. Tom wants the hitman stopped but the police are closing in. A motorcycle driver has been hired to cause an accident involving John.

John and Susan realise they're being tailed and outsmart their pursuer. When John gets too close to seeing his father, the pair are trapped underground.

Tom refuses to leave the Falcon pub unless he knows John is safe, but Bowers has conned him. With his father long gone, John and Susan reach an exit to the surface.

Susan finds a rope to help John but the motorcyclist is still in the area. A friendly garage attendant learns that the group holding John's father bought a map of Ullswater. John and Susan rent a canoe and attempt to outflank the abductors.