The Ultimate Truth by Kevin Brooks

 The Ultimate Truth by Kevin Brooks

When Travis Delaney's parents die in a car crash, Travis is devastated. In a bid to pull himself out of his grief, he starts to look into the last case they were investigating at the private investigation agency they ran.

What starts as a minor distraction soon becomes a sinister, unbelievable mystery - and Travis is determined to solve it. Why were his parents looking for a missing boy when the boy's family says he isn't missing? Where is the boy himself? And why would a man who is in surveillance photos taken by Travis's parents turn up at their funeral?
As Travis searches for answers, he starts to have the chilling realization that the question he should be asking is the one he most wants to avoid: Was the accident that killed his parents really what it seemed?