Escaping from the police, The Baron, a gentleman crook, learns that Colonel Patterson, a wealthy banker, is remodeling his house as a surprise for his daughter, Mildred, who is about to be married to Robert Wallace. The Baron goes to the house, and, by impersonating the architect, discovers the location of the safe and also gains the confidence of Mildred, who is angry at Robert for kissing a vamp. Mildred arranges with The Baron to feign a kidnapping in order to test Robert's loyalty; but she soon regrets the deception, for The Baron, having burgled the Patterson safe, really does abduct her. Trapped on a runaway train, she is rescued by Robert just as it crashes into a deep river. Mildred forgives Robert for his indiscretion with the vamp, and The Baron is apprehended.