Gone with the Win by Mary Daheim

In Gone with the Win, another charming entry in Mary Daheim’s beloved Bed-and-Breakfast series, someone from Judith McMonigle Flynn’s past comes knocking, and the reluctant amateur sleuth finds herself working a case so cold it's practically frozen.
 
Ruby Tooms drops her bags and a mystery on the lovely Persian carpet of Hillside Manor, Judith’s bed-and-breakfast in Seattle.
 
Ruby’s mother was strangled years before, soon after her divorce from Ruby’s father—and the killer is still at large.
 
Undaunted, Judith agrees to help Ruby. Cousin Renie grudgingly pitches in, and even Judith’s husband, Joe, gets involved.
 
The game’s afoot and ahoof with Judith discovering that the hand she's been dealt includes not only a joker but that deadly card, the Ace of Spades. And, she’s off…in pursuit of a killer.