Mathias Pascal, saddled with a stupid wife and a nagging mother-in-law, leaves home and is extremely lucky at several gambling resorts. He returns home and discovers that a drowned man, fished out of the river, bears an uncanny likeness to him and is being buried by his family as him. This, to him, is a pleasant turn of events and he goes to Rome, where he falls in love with Louise Paleari. Count Papiano, a jealous suitor of Louise's, threatens him with arrest unless he produces credentials to prove his identity.
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