Doctor Waring is concerned about his daughter, Shelia. She is working for a wealthy stamp dealer and has fallen in love with him.

The doctor has made enquiries about the dealer, Michael Rentour and now knows that he is a very dubious person. His daughter will not listen to him so Doctor Waring goes to see Rentour to ask him to sever his connections with his daughter.

He refuses and the doctor shoots him. When the police investigate their suspicions fall on Shelia - he had not been truthful about her alibi. The doctor confesses to the police that he had committed the crime - but they do...