Dos pares de mellizos

Unbeknownst to Stanley and Oliver, their long-lost twin brothers, sailors Alfie and Bert are in town on shore leave carrying a valuable pearl ring entrusted to them by their ship's captain. All four get involved in multiple cases of mistaken identity as a gang of hoodlums try to steal the ring Stanley and Oliver wind up with their feet in cement, about to be dumped into the harbor.