Nicholas Blake 
Sad Variety [EPUB ebook] 

A VINTAGE MURDER MYSTERYThe government’s security department have asked private detective Nigel Strangeways to keep a discreet eye on Professor Alfred Wagley, a research scientist who is spending the Christmas holidays in the South-West of England. But someone else is also very interested in the professor and his work, and when his young daughter is kidnapped, Nigel finds himself in a race to avert a tragedy.A Nigel Strangeways murder mystery — the perfect introduction to the most charming and erudite detective in Golden Age crime fiction.