An eccentric professor and a policewoman pursue criminals and find love.
Bates plays the titular Oliver, a keen word-game enthusiast and lecturer in comparative religion. After his teaching post is made redundant, he resolves to make use of his new wealth of free time by going to visit his favourite crossword compiler, 'Aristotle', with whom he has corresponded but whom he has never met. When he arrives, however, he finds Aristotle's house has been ransacked and its occupant has departed for parts unknown, and he sets out to discover why.

Peter Vaughan
Delaney

Michael Byrne
Moody

Charlotte Coleman
Cathy

Sinéad Cusack
WPC Diane Priest

Alan Bates
Oliver

Bill Paterson
Baxter

Morgan Jones
Michael Priest
Sophie Uliano
Sara
Sue Roderick
Norma Moody
Search Party69%
Agatha Christie's Marple78%
Suspicion67%
I Will Find You82%
Vigil71%
Shakespeare & Hathaway - Private Investigators72%
Sugar71%
Tyler Perry's Sistas84%
A Nero Wolfe Mystery78%
Troppo68%
Goliath75%
77 Sunset Strip72%
The Witness61%
The Purge69%
A Touch of Frost75%
Inside Man68%
Steal74%
Sexy Beast61%
Barnaby Jones70%