The Sad Variety — Nicholas Blake

Nigel Strangeways is asked by the Security Department to guard Professor Wragby and his daughter. Wragby has a secret the Russians are out to get. But by the time Nigel arrives, the Russians have already kidnapped the Professor's daughter. The Professor will do anything to get her back…and Strangeways is thrown into a bizarre game of hide-and-seek where the prizes are a terrified girl, a deadly secret and a slab in the morgue.