Navy Spy (1937)

A group of international and American criminals are trying to learn the secret formula of a concentrated vapor fuel invented by a U. S. Navy officer, Lieutenant Dan Carrington (Jack Doyle), who mysteriously disappears. Secret Service agent Alan O'Connor (Conrad Nagel), assisted by federal agent Bobbie Reynolds (Eleanor Hunt), is assigned to the case. Anna Novna (Judith Allen), a nightclub dancer who was involved with Carrington may know more about where Carrington is than she cares to divulge.