Jutting from sparkling turquoise waters off the Italian coast, Isle Isola is an idyllic setting for a wedding. In the majestic cliff-top villa owned by the wealthy Compton family, up-and-coming artist Claire Hunter will marry handsome, charming Jack Compton, surrounded by close family, intimate friends...and a host of dark secrets. From the moment Claire sets foot on the island, something seems amiss. Skeletal remains have just been found. There are other, newer disturbances, too.

FBI Agent Ella Dark, 29, is given her big chance to achieve her life’s dream: to join the Behavioral Crimes Unit. Ella has a hidden obsession: She has studied serial killers from the time she could read, devastated by the murder of her own sister. With her photographic memory, she has obtained an encyclopedic knowledge of every serial killer, every victim, and every case. Singled out for her brilliant mind, Ella is invited to join the big leagues. 

Ex-CIA master assassin Court Gentry has always prided himself on his ability to disappear at will, to fly below the radar and exist in the shadows - to survive as the near-mythical Gray Man. But when he takes revenge upon a former employer who betrayed him, he exposes himself to something he’s never had to face before. A killer who is just like him. Code-named Dead Eye, Russell Whitlock is a graduate of the same ultra-secret Autonomous Asset Program that trained and once controlled Gentry.

Seven years ago, Terry Archer and his family experienced a horrific ordeal that nearly cost them their lives. Today, the echoes of that fateful night are still audible. Terry's wife, Cynthia, is living separate from her husband and daughter after her own personal demons threatened to ruin her relationship with them permanently. Their daughter, Grace, is rebelling against her parents' seemingly needless overprotection. Terry is just trying to keep his family together. And the entire town is reeling from the senseless murder of two elderly locals.

And at 32 years old, Travis Devine's swapping fighting the Taliban and Al Qaeda for a different kind of danger in the cut-throat world of high finance. His daily commute on the 6.20 a.m. train into New York’s financial district, to his new job as an analyst at the minted powerhouse investment bank Cowl and Comely, takes him into a world where greed, power, jealousy and ambition result in the financial abuse of the masses and the enrichment of an elite few. But it is on this daily journey that he passes a house where he sees something that sounds alarm signals he cannot ignore.