Elk Books in Order

A secret criminal organization terrorizes London, leaving frog tattoos as its signature. After an undercover officer is murdered, Detective Sergeant Elk must uncover the elusive leader whose followers refuse to talk and whose crimes keep multiplying.

Aileen Rivers crosses paths with millionaire Stratford Harlow and Scotland Yard's James Carlton while her uncle serves a prison sentence. After a car accident brings her to Carlton's attention, an evening call for help pulls him into the mystery.

Lord Frensham suspects Anthony Braid of swindling him, while Braid accuses Frensham's nephew instead. When Frensham dies in an apparent suicide, Inspector Elk must investigate both the financial deception and the suspicious circumstances of his death.

A stabbing in London's Tidal Basin raises questions about a feared killer and another mysterious criminal called White Face. Superintendent Mason investigates the connection, using his distinctive questioning methods to pursue answers in the waterfront district.