Across the world, thousands of people are shocked by a notification that they once chose to have a memory removed. Now they are being given an opportunity to get that memory back. Four individuals are filled with new doubts, grappling with the unexpected question of whether to remember unknown events, or to leave them buried forever. Into their lives comes Noor, a psychologist working at the Nepenthe memory removal clinic in London. The process of reinstating patients’ memories begins to shake the moral foundations of her world. As she delves deeper into how the program works, she will have to risk everything to uncover the cost of this miraculous technology.