A code expert working for Naval Intelligence is assigned to decode enemy messages despite his desire for active duty.
| Actor | Role |
|---|---|
 Lee BowmanLt. Bill Gordon | Lt. Bill Gordon |
 Jean RogersElaine Carter | Elaine Carter |
 Mona MarisOlivia Kerlov | Olivia Kerlov |
 Carl EsmondAndre Leemuth | Andre Leemuth |
 Paul CavanaghCmdr. Charles Brennan | Cmdr. Charles Brennan |
 Grace LemJapanese Woman | Japanese Woman |
 Russell HicksJohn Carter | John Carter |
 Blanche YurkaMrs. Savarina | Mrs. Savarina |
 Arthur ShieldsProf. Harvey Lessmore | Prof. Harvey Lessmore |
 Addison RichardsGordon Trisby | Gordon Trisby |
 Milburn StoneHotel Desk Clerk | Hotel Desk Clerk |
 Hans ConriedHotel Desk Clerk | Hotel Desk Clerk |
 Byron FoulgerDecoder | Decoder |
 William Post Jr.Lanny | Lanny |
 William TannenJasper Dean | Jasper Dean |
 Frederick WorlockDr. Jackwin | Dr. Jackwin |
 Curt BoisKestrin | Kestrin |
 Felix Baschde Segroff | de Segroff |
 Edward FieldingSecretary of the Navy | Secretary of the Navy |