Herbert Wrayson, a bachelor returns to his flat one night to find a young lady rifling his desk. He questions her and finds she thought she was in the apartment of his neighbor, Morris Barnes, who lives above him. While he is on the telephone, she quietly slips out of his flat and heads to Barnes' abode. A few hours later, she is once again at his door this time looking scared and faint. She asks Wrayson to escort her downstairs as the hallway is unlit. As they emerge, a hansom sits at the doorway with Morris Barnes in it. But, they discover that Barnes has been strangled. Wrayson soon learns that the young lady is the estranged older daughter of a club acquaintance, retired Colonel Fitzmaurice. He also discovers that he has fallen in love with her. The big question however, has he fallen for a murderess? How can he discover the truth? In typical Oppenheim style, this "whodunit" weaves a tangled web and one must wait until the end to discover the surprising truth.

Edward Phillips Oppenheim was an English novelist, primarily known for his suspense fiction. He was born on 22 October 1866 in Leicester, the son of a leather merchant, and after attending Wyggeston Grammar School he worked in his father's business for almost 20 years, beginning there at a young age. He continued working in the business, even though he was a successful novelist, until he was 40 at which point he sold the business. He wrote his first book 'Expiation' in 1887 and in 1898 he published 'The Mysterious Mr Sabin', which he described as "The first of my long series of stories dealing with that shadowy and mysterious world of diplomacy." Thereafter he became a prolific writer and by 1900 he had had 14 novels published. While on a business trip to the United States in 1890 he met and married Elise Clara Hopkins of Boston and, on return to England, they lived in Evington, Leicestershire until the First World War,and had one daughter. His wife remained faithful to him throughout his life despite his frequent and highly publicised affairs, which often took place abroad and aboard his luxury yacht.