Hide and Seek — Kathi Daley

Sydney Whitmore, a forensic psychologist working for the FBI, moves to Shipwreck Island and renews her relationship with Ezra Reinhold, a reclusive billionaire who enjoys poking around in cold cases and has the means to hire the best people to find the answers no one else has been able to.In book 6 in the series, Syd is asked by the FBI to escort the child of a key witness in a murder trial to a safe house after the US Marshall who'd been watching the child was killed. The Marshall who'd been watching the child managed to get off a message before she died letting the FBI know that there was a mole within the organization who'd given up their position, so Syd and the child set off on a journey where no one can be trusted and nowhere really feels safe.Meanwhile it's Christmas on Shipwreck Island and the entire family is involved in seasonal events and activities.