Hancock upsets his fellow passengers on a flight to Switzerland and then discovers that he has to share his room at the hotel. Initially he thinks that he is sharing with an attractive French girl only to discover that it is really a yodeller and Alpine Horn player.

Hancock dreams of becoming the great detective 'Sexton Hancock' and proceeds to unravel a complicated murder plot.

Sid has set up an amusement arcade, but when Hancock finds out he leads a campaign to have it closed down. Meanwhile, Hancock seeks election to the Council but when Sid's arcade is closed down he moves it to Hancock's house.

Hancock and Sid return from holiday to discover that Sid has failed to cancel any deliveries and has left every electrical appliance in the house on. Hancock decides that in order to make ends meet he and Sid must go on an economy drive. But Hancock soon encounters difficulties in the local self service café, and the stairs at home prove problematic as well.

Hancock takes out a murder mystery book from the library. When he discovers that the last page is missing he is determined to deduce who the killer is. But when he finds that it's too complicated to decipher he decides to track down a copy of the complete book.

Sid has fallen in love with the conductress of a 93 bus but he doesn't know how to approach her. Seeking Hancock's advice, Sid travels on the bus but his attempts cause chaos both with the conductress and the driver... who is her husband.

Hancock decides to give a pint of blood. But he is alarmed when he discovers he has to give very nearly an armful, and he is determined to find out who it goes to.