In Jayne Ann Krentz's thrilling novel, three women—Pallas Llewellyn, Talia March, and Amelia Rivers—find their lives intertwined after a life-changing night at the Lucent Springs Hotel, which they can't remember. Now close friends and hosts of the Lost Night Files podcast, they explore cold cases and their enhanced psychic abilities, seeking answers about their lost memories.

When Pallas receives a tip about an abandoned asylum in Carnelian, California, she encounters Ambrose Drake, who believes he witnessed a murder at the Carnelian Sleep Institute during his own lost night. With the town's residents reluctant to discuss the past, Pallas and Ambrose team up to uncover the truth, using the podcast as a guise.

As they delve deeper, they face danger from those who want the truth buried. With their investigation putting them at risk, Pallas and Ambrose must unravel the mysteries of their pasts and the secrets of Carnelian before they become the next victims.