Run Away by Harlan Coben

Simon Greene is a successful businessman with a beautiful wife and 3 kids. It seems like he's got it all. But somewhere along the line his beautiful daughter got off track and became a drug addict involved with a much older guy (who kept her hooked on drugs). Simon is determined to get her back but things don't go at all as planned. His wife ends up in a coma, the boyfriend ends up dead, and there appears to be something way more complicated than just drugs going on. It's quite the nail-biter and you really feel for Simon, who would do anything to save his family.