Scientist Waldo Samson (Alec Craig) has discovered how to manufacture cheap synthetic diamonds that are nearly identical to actual diamonds, as he demonstrates to diamond industry representatives and New York Police Inspector Mike O'Hara (James Gleason). Samson only wishes to provide them for the American defense effort, but O'Hara insists on providing him with a police guard. Lawrence and his fiancée finally are able to resume their their romantic getaway, but once on board their aircraft, a beautiful young woman greets Lawrence, arousing Helen's jealousy.