Edward Royle is the head of a well-known chemical manufacturer in England, which he has inherited. He is engaged to the daughter of his father’s former partner, Phrida Shand, who lives with her mother. One night he is asked by his friend, Sir Digby Kemsley – a very famous railroad engineer, to come to his flat to discuss something although Kemsley is quite mysterious on the telephone. Royle visits, then returns home only to be summoned again by Kemsley, this time imploring him to return at once. Royle finds a gentleman in Kemsley’s place who is clearly not Kemsley, or is he? Kemsley asks Royle to trust him but that night, a young woman is murdered at Kemsley’s flat. Kemsley has disappeare...

From the Preface - In these modern times of breathless hurry and great combines, when birth counts for nothing; when fortunes are made in a day and credit Is lost in an hour, men’s secrets are sometimes very strange ones. It is one of these which I have here revealed; one that will, I anticipate, both startle and puzzle the reader. The mystery is, in fact, one taken from the daily life about us, the truth concerning it having hitherto been regarded as strictly confidential by the persons herein mentioned, although I am now permitted by them to make the remarkable circumstances public.