A billion ways to die

the long version

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 continents and oceans. The slightly brain-damaged, tech freak researcher and the blackjack dealing psychologist had convinced themselves that life aboard a sail boat in the Caribbean, incognito and in love, could be a lasting refuge. The death of that illusion was as brutal as it was abrupt. Even people who knew how to dodge ruthless outlaws and relentless law enforcement learned there were powers from which no one could ever hide.