Gervas Carew's wife, Elinor, has deserted him while he was fighting for France, for Lord Clyde Geraldine, a cad of the first order, but Elinor, in turn is cast off when Lord Geraldine turns his attention to an Irish lass, Marny. Marny has no idea of Geraldine's past nor his brutal nature.

A young man impersonates his best friend, and in doing so upsets the decorum at a stuffy family gathering and falls in love. The arrival of a gang of hoodlums further disrupts the formalities, but our hero thwarts them and saves the day.