In 1941, the IRA plans a campaign to coincide with the planned German invasion of England. Dermott O'Neil finds it easy to get into the IRA, but can he get out?

Robert Mitchum
as Dermot O'Neill

Richard Harris
as Sean Reilly

Anne Heywood
as Neeve Donnelly

Dan O'Herlihy
as Don McGinnis

Cyril Cusack
as Jimmy Hannafin

Niall MacGinnis
as Ned O'Neill

Marianne Benet
as Bella O'Neill

Christopher Rhodes
as Tim Malone

Harry Brogan
as Patrick O'Neill

Eileen Crowe
as Mrs. Kathleen O'Neill