Dead Even — Brad Meltzer

Sara Tate, Manhattan district attorney, has grabbed a case that could make her career. She's smart, tough, and sure to get a conviction...until Jared, her husband and a powerful defense attorney, is hired by the other side. But Sara doesn't know Jared has been warned to get his client off or she will be killed. Hiding desperate motives, the couple begin a vicious battle in court and at home. For Sara has a terrible secret too...and both soon face an unthinkable truth: No matter who wins, the other may die.