Edward Marston 
The Unseen Hand 
The WWI London whodunnit

1917. The Lotus Hotel offers sanctuary for its exclusively female clientele, attracting the cream of London's society. But a dead body found in one of its rooms is hardly good for business, and when it is discovered that the woman was neither a guest nor a member of staff, the Lotus's reputation as a safe haven is cast in doubt.Inspector Marmion and Sergeant Keedy are dispatched to look into the events at the hotel and soon suspect foul play. Tangling with a forgetful widower, a wily competitor and the haughty hotel owner, the pair will have to delve into the past to solve this crime in the present.

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Edward Marston has written well over a hundred books, including some non-fiction. He is best known for his hugely successful Railway Detective series and he also writes the Bow Street Rivals series featuring twin detectives set during the Regency; the Home Front Detective novels set during the First World War; and the Ocean Liner mysteries.