Charlie Chaplin plays an escaped convict from the state penitentiary who, clad in his striped prison uniform, is on the run from prison guards. He skillfully and athletically manages to elude a handful of guards at a rocky seashore, eventually making his escape by entering the water. Charlie opportunistically happens upon a man in a rowboat who is preparing for a swim. Charlie steals the man’s swimsuit and heads to shore. He hears cries for help as a woman, her mother, and the woman’s suitor have all fallen into the water and are poor swimmers. Charlie rescues them all, but carelessly allows the enormous suitor to fall back into the water while he is attempting to carry him on a stretcher. Charlie rescues him once again, but the angry suitor kicks Charlie senseless into the water. Charlie wakes up in a bedroom in the lavish home of the grateful girl and her mother. He is wearing striped pajamas and for a moment he believes he is back in prison. He identifies himself as a yachtsman and is given a set of evening clothes to wear to a party. Charlie’s luck begins to run out, however. The girl’s father turns out to be the judge who sentenced Charlie to a prison term. Charlie looks vaguely familiar to the judge, but he cannot quite place him. The suitor, now especially miffed at Charlie because of the attention the girl is giving him, sees Charlie’s photo in a newspaper as a prison escapee. Meanwhile, a house employee is feeding her beau a meal in the kitchen; the beau happens to be one of the guards who was chasing Charlie on the beach. The suitor summons the authorities who pursue Charlie on a merry chase up and down the two-story house where Charlie’s acrobatic skills save him from arrest several times. Just as it looks like Charlie will finally be apprehended, he cleverly escapes again and the chase is renewed.