Using technology to inhabit the memories of others, a woman must choose between saving the love of her life or the world, in this staggering technothriller from the bestselling author of Ascension . Maggie Webb has lived the last decade of her life in a loop. Ever since her husband Stanley was diagnosed with Alzheimer's, she's made it her job to remember all the beautiful moments of their fifty-plus years together for the both of them. Overwhelmed with grief and the loss of the man she once knew, she finally entrusts Stanley's care to an assisted living facility called Sunrise. One day, a mysterious stranger named Hassan appears at Maggie's door and tells her about a man whose memories were stolen from him in an experiment run by Sunrise. Hassan suggests that the same thing could be happening to Maggie's husband. Maybe Stanley's illness isn't what it seems. Better still, it may be reversible.

The only way they can know for sure is by breaking Stanley out of Sunrise, and breaking into his mind. What follows is an exhilarating time-heist: an action-filled romp across continents and centuries, across time, space, and memory. Ultimately, diving into Stanley's mind poses grave risks, not only to him--it might also alter the course of human history.