This is a very good classic crime story with amateur but excellent detectives.

Toby Lorn calls on his friends, Sally and Johnny Heldar to help. He works at the National Press Archives, and an archive assistant, Frank Morningside, is getting nasty letters and having tricks played on him. Someone has gotten the key to his office so they can leave the messages easily with no one seeing.

Sally and Johnny agree to help, and begin watching the office in the guise that they are doing research on the archives. They are being helped by Brigadier Camberley, who has been doing some research in the archives. When Morningside is found dead in the doorway of his office (from a box of glass negatives falling on his head), Scotland Yard is finally called. Chief Detective-Inspector Lindesay arrives on the scene. However, he lets Sally and Johnny continue to help. There are many suspects to watch - young Teddy, the errand boy who is somewhat unruly; Michael Knox, the hot tempered Irishman; Serena, Morningside's former fiance, the boss Silcutt, as well as possibly Toby, himself.

Then, Miss Quimper, the woman who was in charge of the negatives, is found in a bombed out cellar hole right across from the Archives building. Things get really dicey. They check everyone's alibis again and set up time tables, but are still stymied. Sally and Johnny have a meeting in their apartment, and suddenly they realize the killer is someone they never suspected, and figure out how and why.

Answer in the Negative by Henrietta Hamilton was a great read about a husband and wife sleuthing team in 1950's London. The plot moved swiftly, there were many intriguing suspects and the ending was satisfying. Besides the mystery, it was really interesting to get an insight into the way newspaper cuttings and photos were handled before computers and to get a peek into class warfare going on in Fleet Street

I hadn't hard of the author before so I was glad to rediscover a lost gem. I hope the publisher will republish some of her other works as I became quite fond of Sally and Johnny.

Thanks to the publisher and NetGalley for providing an advance copy in exchange for an honest review.