Play Dead by Harlan Coben

Play Dead - Supermodel Laura Ayars and basketball star David Baskin are on their honeymoon in Australia.  David goes for a swim and is never heard from again.  Although David’s body is recovered and his death declared an accident, Laura begins to have doubts and begins her own investigation.  This leads her to the suicide of David’s father 30 years prior, but what does that have to do with David’s death.