Prince Leo, last in the line of rulers of a long-deposed monarchy on continental Europe and jaded with the frenetic search for kicks with the European jet-set, returns to his father's London town house for rest.

Marcello Mastroianni
as Prince Leo

Billie Whitelaw
as Margaret

Calvin Lockhart
as Pimp Roscoe

Vladek Sheybal
as Laszlo

Graham Crowden
as Lawyer Max

Gwen Ffrangcon Davies
as Hilda

Glenna Forster-Jones
as Salambo

David de Keyser
as David

Keefe West
as Jasper

Kenneth J. Warren
as Kowalski