King of Hearts — Susan Moody

Ex-biology teacher Cassandra Swann turned in her lab coat to pursue her true passion: playing bridge professionally. But she soon found that her card sense translated into a surprising skill for detection--and now she's making her bid to become the bridge world's first amateur sleuth...

The racehorse on the television screen was named Handsome Harry--startling Cassie into a sudden memory of her father, who'd gone by the same nickname and had died during a bar brawl many years ago. But when Cassie saw the horse's owner, she knew it was more than coincidence: The woman looked exactly like someone who'd been at the scene on that fateful night.

But while Cassie's trying to solve the riddle of her father's death, another case demands her attention: the murder of an Indian doctor who had been one of her bridge pupils. And the more she investigates, the more she fears that the stakes are getting dangerously high...