Synopsis by Hal Erickson
Canine star Rin Tin Tin Jr. finds himself in foggy London town in this fast-paced meller. The story doesn't make much sense, but it seems to have something to do with a vicious "ape man" who holds the city in thrall. The hirsute villain overpowers hero Walter Merrill and abducts heroine Helene Costello, whereupon Rinty springs into action. The dauntless doggie nearly tears the ape man to shreds before the London bobbies catch up with him. According to contemporary reviews, none of the human stars received as many close-ups as Rin Tin Tin, leading one wag to suggest that the dog star had inherited Gloria Swanson's press agent.