Broken

Nick Harding has a new case. Actually, two of them.
A very rich old dude is about to kick off and is desperate to make amends with his estranged son. Nick is contacted by the old guy's lawyer with a task: Find the son, convince him to get in contact with his father, and help mediate the relationship.

Nick hates mediating.
That same day a friend of a friend engages him to track down a serial deadbeat who has bilked a small financial services company out of millions of dollars. The fee is lower, but the job is more up Nick's alley.
Then the heir's life is threatened, the deadbeat has a compelling backstory and everything Nick thought he knew was wrong.