Government agent Dick Barton battles a ring of Nazi spies who are planning to poison the entire London water supply.
Don Stannard
Dick Barton
George Ford
Snowey White
Jack Shaw
Jock
Gillian Maude
Jean
Geoffrey Wincott
Dr. Casper
Farnham Baxter
Roscoe
Morris Sweden
Regan
Beatrice Kane
Betsy Horrock
Arthur Bush
Schüler
Ivor Danvers
Snub
Ernest Borrow
Gilpin
Colin Douglas
Stark
Janice Lowthian
Adele Reed
Alec Ross
Tony Burton
Campbell Singer
Sir George Cavendish
