This is a recurring theme in Coben books, somebody starts looking for somebody/something from the past, or one who wouldn't let the past be, throwing their ordinary lives into mystery and danger. As they start looking for something they realise that things are not as they seem, and more and more they dig, they put their loved ones and their own life in jeopardy. But one has to know, even if one knows that life would never be same again.
Coben is a master of twists and turns. As usual he creates a multi- layered complicated plot with too many bizarre and seemingly unconnected events that make sense in the end with lots of surprises thrown in. But if you have read most of his books like me, when the revelation comes your likely to say didn't he use the same thing in that book. But there are enough surprises to let this pass.
My post for Crime Fiction Alphabet S.