Title: Poison for One
Description: Eighteenth in the long-running mystery series with Dr Launcelot Priestley.

>The weekend guests of the financier Sir Gerald Uppingham at his country estate Bucklesbury Park break into his locked study and discover his corpse, dead of prussic acid. Inspector Hanslet of Scotland Yard is called in, but as usual, he is forced to turn to Dr Priestley to fully solve the complex question of how and why Uppingham died and who killed him.