A Nazi spy passes himself off as an optometrist in San Francisco's waterfront district. Someone robs him of his codebook, and he must get it back.

A Nazi spy operating as an optometrist on the San Francisco waterfront discovers that his code book, which also has the names of his fellow Nazi agents and saboteurs, has been stolen. His attempts to track it down before it falls into the hands of the authorities result in a trail of murder and blackmail.—[email protected]