The rich and respected London doctor Roger Mills has invited six of his best friends onto his boat on the Thames - he won't survive the trip.
Peter Finbow
Ian Capel
Avice Lorring
Tonia Gilmour
William Garnett
Christopher Tarrent
Elisabeth Tufts
Roger Mills
Sergeant Birrell
Sergeant Frazer
Dr. Parfitt
Professor Boothby
Inspector Allen
Philip Wade
