Jake Sullivan is back.

After waking from his coma and rehabilitating his mind and body, he heads to Key West with Mike Lang to combat a new threat.

But he is still plagued with severe headaches, lack of focus, and trouble remembering important details of the night he was shot.

A late night assault at his office turns out to be the catalyst that allows him to concentrate and focus once again. Although the headaches are gone, he still cannot remember the thing he knows to be the key to everything!

At the same time, he and Mike are hunting for a deadly toxin threatening the Keys, a hunt that ultimately leads them to the Bahamas and to the discovery of who is friend and who is foe.