Margery Allingham 
The Crime at Black Dudleylack Dudley 

When George Abbershaw is invited to Black Dudley Manor for the weekend, he has only one thing on his mind — proposing to Meggie Oliphant. Unfortunately for George, things don't quite go according to plan. A harmless game turns decidedly deadly and suspicions of murder take precedence over matrimony. Trapped in a remote country house with a murderer, George can see no way out. But Albert Campion can.