Dudley Leake is preparing to marry Mary Bogle. He gets drunk in his bachelor party, and misses his own wedding. While drunk, he describes a brief fling which he had back in 1914. Shortly after, a young man by the name of Joe Piper introduces himself to Dudley. Joe claims to be Dudley's illegitimate son from that brief fling. He proceeds to blackmail his supposed father, threatening to expose their relationship to the wealthy Bogle family. Dudley has to find a way to silence the blackmailer, to save his marriage. He also has to find whether Joe is really his son or not.