Eighteen years ago, FBI Agent Darcy Hunt’s life changed forever when her little sister was abducted right under her nose—murdered by a crazed guild of misguided zealots.

Taylor Smith hasn’t always had it easy, but she worked hard for her college scholarship and makes do with her job—all to avoid ending up like her parents. Claire, her roommate and best friend, is the exact opposite, rich beyond Taylor’s comprehension and maybe a little high maintenance. When a charming man named Dylan shows up at Taylor’s work and asks her out on a date, she is flustered, but flattered.

After surviving a terrible attack, Quinn Fleming has recovered in every way but one—her ability to retain new memories. Now, months later, it appears to the outside world as if the San Diego florist’s life is back to normal. But Quinn is barely holding on, relying on a notebook she carries with her at all times, a record of her entire existence since the assault. So when she witnesses a murder in the shadowy alley behind the florist shop, Quinn immediately writes down every terrifying detail of the incident before her amnesia wipes it away.

Lucy and her husband, Adam, have been best friends with another couple, Cora and Scott, for years. The four are practically family—they vacation together, co-own a beach cottage, and their children are inseparable. So Lucy is devastated when, while looking at a colleague’s photos of a trip to the Maldives, she spots a picture of Scott, apparently on vacation with another woman.

The police are desperate for information on the triple homicide. Detective Joona Linna enlists the help of hypnotist Erik Maria Bark. But when Bark unlocks the secrets in the boy’s memory, he triggers a terrifying chain of events that will put all their lives in jeopardy.