During World War I, an illegitimate son of the German Kaiser, who had been raised in the US--and is a double for the Kaiser's son, the Crown Prince--is sent to Germany as a spy in order to kill both the Kaiser and his son.

Shirley Kaye is the vivacious daughter of Egerton Kaye, president of the great Union Central Railroad. The latter holds his position through his descent from "Pirate" Kaye, who founded the line, rather than through any executive ability of his own. Shirley is queen of the most exclusive Long Island set, and as clever as she is lovely to look at. From the West comes T.J. Magen, a rough but lion-hearted financier, who buys the house next door to the Kayes. Magen cares little for society, and the elaborate household which their wealth forces them to support is a constant worry to his simple and unassuming wife. But the daughter, "Daisy," yearns, with all her heart to break into the society and swim where Shirley Kaye reigns supreme.

A farce in which the German Kaiser and the Crown Prince are defeated and made sport of by a plucky American girl and several American prisoners of war.