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.


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John Bentley
Det. Insp. Dan Barker

Phyllis Kirk
Judy Roberts
LW
Leonard White
Det. Sgt. Mack McLeod

Glyn Houston
Charlie Williamson

Patrick Jordan
Albert Fisher, called both "Al" and "Bert"
HA
Harold Ayer
Steward Alfred Gordon, also called "Al"

David Hurst
Paddy Maclure

Charles Lloyd Pack
John Hendrick

Robert Ayres
Ship's Captain Watford