Brenner, a police investigator, fears that his partner, Katrina, has encountered danger while she is undercover in Durham, North Carolina. They had secretly agreed to investigate a vacation-spa company against their chief's orders. Brenner's grandma had died while on vacation, along with others within a short period of time. The chief believed that it was coincidence. Now, Katrina had not contacted Brenner after going undercover. Why did no vacationer remember anything except faded flashes of foamy waves? Why couldn't they remember how they had lost weight? The returnees were happy with their new figures, never caring how it happened or why they had memory lapses. Why did the vacation company not tell tourists where they were going? Why did the vacationers still not know where they had been? Katrina ran into her own puzzling questions as she hid inside the headquarters. Why were the mobs of vacationers that lined the sidewalk never seen leaving after arrival; but no sounds of chattering were heard inside? Why did medical supplies fill one room? Katrina and Brenner navigate through bizarre events to seek answers until Katrina is kidnapped. Brenner resolves to uncover the circumstances of his grandma's death, but in doing so, he has put someone else, whom he cares for, at risk.