A Conspiracy of Aunts — Sally Spencer

A twist-filled thriller about a dark and deeply buried secret by an “accomplished” master of suspense (Publishers Weekly).
 
After his mother was drowned at sea, young Robert -- a child prodigy at bridge -- was raised by her four sisters: Jacqueline, Peggy, Catherine, and Sadie. Despite their indifference and neglect, Rob developed his skills until he is head and shoulders above his adult competition, destined to become a Grand Master. What he didn't know was that his aunts have made a solemn pact never to reveal exactly how his mother died.
 
As an adult, Rob has become a celebrity bridge genius and his aunts have died one by one. The new woman in his life is an ambitious reporter named Rosalyn. As Rob's star continues to rise, Rosalyn struggles with jealousy -- and craving fame as a journalist, she digs and digs until she discovers the secret of the pact that Rob's aunts swore to each other. And it will have devastating consequences . . .