The Case of the Abominable Snowman — Nicholas Blake

Nigel Strangeways is summoned to Easterham Manor in the depths of winter to investigate a series of strange events, which culminate in the apparent suicide of a wealthy young woman whose behaviour has scandalised the village.

As Nigel begins his investigations into the dead girl's past, it soon becomes clear that someone in the manor is trying to hide something, and they will stop at nothing to keep their secrets safe.