Edgar Wallace 
The Dark Eyes of London 

„The Dark Eyes Of London” is a crime novel by the British writer Edgar Wallace which was first published in 1924. Inspector Holt and his valet Sunny are planning a visit to Monte Carlo when an urgent telegram arrives from the Chief Commissioner of Scotland Yard. Mr. Gordon Stuart has been found drowned in suspicious circumstances. An unbalanced doctor and his brother murder a series of wealthy men to benefit from their life insurance policies, using a charity for the blind as a front for their activities. Holt returns on the same boat as Flash Fred Grogan, continental crook and gambler. Attempting to solve the mystery leads Holt into a string of exciting adventures and romance. It was based on an earlier short story „The Croakers” which Wallace had written.