Victor Moore, a young jewelry salesman, who has just been married is leaving with his bride on the Clyde steamer on his honeymoon. Bill Manton and Bert Scott, two friends of his, determine to play a joke on him. They read in the paper that Mrs. Holstein of West 72nd Street has been robbed of $75,000 worth of jewelry and that a former maid and butler are suspected. They write a note to the chief of detectives and inform him that the maid and butler are making a getaway on the Clyde steamer, sailing that day, posing as a young married couple. By a singular coincidence the real crooks wanted for the robbery are employed on this steamer as stewardess and steward; the plunder is concealed in the steward’s cabin. Vic and his bride arrive on the boat and find that their stateroom has been decorated by their friends. The only mar to their happiness is the dog that Vic’s bride insists on taking with them. Vic loses his new high hat overboard while going up the gangplank. The thieving steward lends him his cap. The chief of detectives receives the joker’s note and sends Vera Fleming and Darnton, two detectives after him. Before they arrive, Vic has had trouble with the bride about the dog who has chewed up her new hat. Unseen by her he drops the dog over the side of the boat but it is caught by Moulton, a souse. The jewelry firm Vic works for send a sample case of jewelry to him by messenger to deliver in Jacksonville. The thieving steward overhears the reading of the letter and seeing the jewelry, determines to get it. The two detectives arrive just before the boat starts and show the steward and stewardess the letter from the jokers. They inquire how many “honeymooners are booked.” The crooks tell them only one couple. Seeing safety for themselves they work with the detectives against the innocent Vic and his bride. Vic and his wife are annoyed after the boat starts by the prying eyes of the two detectives. The stewards tell the detectives that they saw the jewelry taken from the Holsteins in Vic’s room. They determine to arrest them that night. But seasickness prevents them and raises havoc with Vic and his bride. The next morning Vic and his wife are arrested in the presence of the passengers in the salon. Things look back for them until Moulton, who is a detective, proves that the steward and the stewardess are the guilty parties.