A Most Contagious Game by Catherine Aird (Review)
Thomas Harding purchased a country estate sight unseen. He regrets having turned over the matter of the purchase to his wife during his convalescence, but all that changes when the odd placement of an electrical outlet leads to the discovery of a hidden room in the house. When they finally tear away the plaster someone had used to seal the hidden priest's hole, they find an old skeleton. With a current murder investigation, the local law enforcement is not very interested in the older crime. Thomas begins investigating on his own. This is probably going to be an all-time favorite mystery. Thomas uses the same types of principles that a good genealogist would utilize to investigate the persons living in the home at that time period and earlier. This is an absolute gem of a mystery and one that I'm sure I'll want to read again in the future. 5 stars.