Chester Chaste, an honest cab driver, delivers Madame Ritz and her apparent child to a steamship, but ends up accidentally stowing away along with his cab. Madame Ritz is planning to commit jewel robberies aboard the ship, meanwhile, Chester has been given a choice between working as a steward or being thrown overboard, so he goes to work under the cynical eye of Purser Cryder. Chester inadvertently makes the purser's life miserable, but in the meantime discovers the secret of Madame Ritz's "baby."