Captain Grant infiltrates a suspicious lawyer's office by posing as a down-and-out military man.

as Keitel, in a minor but notable villainous role.

The name refers to the frequent ferry travel between London and Dublin used by Nazi spy networks to smuggle information during World War II. Key Cast and Crew The film features several prominent actors of the era: Robert Newton as Captain David Grant. Muriel Pavlow as Marion Decker, an Austrian refugee.