A crotchety, old ex-attorney solves the violent theft of a priceless diamond from his nephew.

Cyril Maude
as 'Grumpy' Bullivant

Phillips Holmes
as Ernest Heron

Frances Dade
as Virginia Bullivant

Paul Lukas
as Berci

Halliwell Hobbes
as Ruddick

Paul Cavanagh
as Chamberlin Jarvis

Doris Luray
as Susan

Olaf Hytten
as Keble

Robert Bolder
as Merridew

Colin Kenny
as Dawson