Undertow — Sydney Bauer

Christina Haynes, daughter of one of the most powerful senators in the country, drowns during a tragic accident with friends off Cape Ann, Massachusetts. To her father, it's no accident. He wants vengeance. Someone's got to pay. And Boston attorney David Cavanaugh is about to take on the most critical and dangerous case of his career.
 
Charged with murder is esteemed lawyer Rayna Martin, the mother of the victim's friend. She was there. She knows what happened. The story should have ended. But a nightmare is just beginning to unfold -- as a father's secrets emerge. As political ambition overshadows justice. And as blackmail and deception claim one more victim in a shocking trial that twists into an act of cold-blooded revenge.