The USA TODAY bestselling novel of terror from “one of the hottest horror authors on the planet” (Paste) and writer of the #HorrorBookTok sensation The Troop!

On a remote island in the Canadian wilderness, five elderly volunteers from different walks of life are given a tantalizing offer: to stall their biological clocks or even reverse them, restoring their lost youth. The chance to put death on pause—forever, perhaps. The remarkable secret lies in the high-tech harnessing of an ancient and extraordinary biological agent…one with no conscience, yet possessed with a single-minded purpose that has helped it persist for eons: the will to survive. The dark heart of unbridled human ambition finds its apex in an unholy experiment that now tests the limits of both creator and subject, eclipsing all bounds of morality and sanity…