Gumshoe

Billie Whitelaw

as Ellen Ginley

Frank Finlay

as William Ginley

Maureen Lipman

as Naomi

Albert Finney

as Eddie Ginley

Janice Rule

as Mrs. Blankerscoon

Oscar James

as Danny Azinge

George Innes

as Bookshop Proprietor

Tom Kempinski

as C.L. Quarry - Psychiatrist

Carolyn Seymour

as Alison Wyatt

Fulton Mackay

as John Straker