The Adventures of Jimmie Dale by Frank L. Packard

About

Frank Lucius Packard (February 2, 1877 – February 17, 1942) was a Canadian novelist born in Montreal, Quebec. He worked as a civil engineer on the Canadian Pacific Railway. He later wrote a series of mystery novels, the most famous of which featured a character called Jimmie Dale. Jimmie Dale is a wealthy playboy by day, with a Harvard education and membership to New York City’s ultra-exclusive private club St. James. But at night he puts on a costume and becomes The Grey Seal, who enters businesses or homes and cracks safes, always leaving a diamond shaped, grey paper “seal” behind to mark his conquest...