British diamond smugglers use the radiowoman (Phyllis Kirk) from a freighter docked on the Thames to unwittingly "mule" their swag, hidden in cigarettes, past customs, not knowing that she has befriended an Inspector for the Thames River Patrol.
Casting arrow_drop_down
John Bentley as Det. Insp. Dan Barker
Phyllis Kirk as Judy Roberts
Leonard White as Det. Sgt. Mack McLeod
Glyn Houston as Charlie Williamson
Patrick Jordan as Albert Fisher, called both "Al" and "Bert"
Harold Ayer as Steward Alfred Gordon, also called "Al"