This poverty-row epic stars William Bakewell as Bob, inventor of a futuristic motorboat engine. Bob's new device may be the salvation for the failing shipping business run by Drexel (Wilfred Lucas), the father of Bob's sweetheart Wynne (Arletta Duncan). But villainous Count Ribalto (Duncan Renaldo) enters the picture, cheating Drexel out of his savings and very nearly ruining his business. Putting his new engine into operation, Bob manages to save the day and send Ribalto packing. It's worth noting that the script for Crime Afloat was written by the film's villain, Duncan Renaldo, long before his career turnaround as TV's Cisco Kid.