Katherine Mortimer, a wealthy and eccentric young woman, spending the summer at the seaside with Mrs. Cochran, her aunt and companion, learns that she has been abandoned by her fiancé, Horace Castlebury, who has run off with Ethel Van Eltinge, a brewer's daughter. The headstrong Katherine vows to marry the first man she meets. She almost immediately enters into a marriage of convenience with Bill, but finds herself falling for the guy. After making a fool of herself when Horace unexpectedly shows up all ends happily when Bill knocks out Horace and tells Katherine he loves her too.