Arthur Cathcart and Natsumi Fitzgerald wanted to believe they were free of the nearly invisible, malignant forces they had pursued, and been pursued by, across the globe. The tech-freak researcher and blackjack-dealing psychologist convinced themselves that life on a sailboat in the Caribbean, incognito and in love, could be a lasting refuge. The death of that illusion was as brutal as it was abrupt. And so it is that Arthur and Natsumi take to the fight.