William Post Jr.

Sherlock Holmes and Doctor Watson must protect a Swiss inventor of an advanced bomb sight from falling into German hands.

Ship Ahoy, a patriotic musical comedy of the WWII era, swings to the tempo of its big-band times. Eleanor Powell plays a leggy lead dancer on a cruise ship who is asked to transport a mine to Puerto Rico. Neither she nor her pulp-fiction-author beau (Red Skelton) knows she's actually working for spies –who got the idea from one of his potboiler novels! The supporting cast includes Bert Lahr (the Cowardly Lion in The Wizard of Oz) and Virginia O'Brien (Till the Clouds Roll By). All of the festivities are set to the swing of Tommy Dorsey and his Orchestra featuring a very young Frank Sinatra as vocalist.

A stentorian narrator tells us that the USA was flooded with nazi spies in 1939-41. One such tries to recruit college grad bill dietrich, who becomes a double agent for the fbi. While bill trains in hamburg, a street-Accident victim proves to have been spying on atom-Bomb secrets; Conveniently, dietrich is assigned to the new york spy ring stealing these secrets. Can he track down the mysterious "Christopher" before his ruthless associates unmask and kill him?

Guided by a cryptic psychic, Charlie links a Hollywood actor's unsolved murder to a Honolulu actress's stabbing, unraveling a tangled web of secrets.