The Conspiracy - Kat Martin

Harper Winston's brother has disappeared. Pursuing his dream of sailing the Caribbean, Michael hasn't responded to texts or emails in days. When even the coast guard can't find him, Harper is forced to take desperate measures - which means going to Chase Garrett, once her brother's best friend, now the only man she can trust...or so she hopes.

As the successful owner of Maximum Security, Chase has learned to trust his gut. He knows Harper's father is mixed up in a deadly business and suspects there's more to Michael's disappearance than meets the eye. Getting involved again with the Winstons goes against everything he stands for, yet old loyalties die hard and he is forced to put everything on the line to keep Harper safe...and both of them alive.

A Lethal Legacy - Heather Graham

Douglas Island sits off the coast of New York State, its imposing cliffs warning away visitors. Still, Finn Douglas has big plans for his inheritance and the rambling manor house that dominates the landscape. But when the broken body of his business partner is found at the base of the rocky escarpment, he fears it wasn't an accident.

Special Agent Craig Frasier agrees to help his cousin Finn by investigating, and with psychologist Kieran Finnegan at his side, heads to the island. As Craig and Kieran delve into the history of the Douglas estate, they discover that the property comes complete with strange lore and a blood-soaked past. Something evil seems to be lurking in the caverns that run beneath the stony ground. Is there something on the island that someone is willing to kill to protect? Kieran and Craig take on a dangerous search for the truth, where one wrong turn could bring them face-to-face with a killer.