Alice Greene knows it's a hoax when the leader of the cult she's been raised in announces the end of the world. She also knows it's the perfect chance to escape before he finds out she's pregnant with the baby she's not supposed to have. But as she watches his prophecy come true and over 100 members of the group disappear into a plume of smoke and light, all her plans crumble.

Still reeling from the disappearance, Alice finds the other survivors and reconnects with her childhood best friend, Edwin. He's got a message from their vanished leader: He and Alice will shepherd the remaining members of the Collective. Certain she's the wrong person for the job, but terrified she'll lose the only family she has left, Alice struggles to find a way forward until she discovers her mother's hidden journal. In it, she learns the secrets and lies that built their community, including one that will change her friendship with Edwin forever.

As the consequences of these revelations come to light and Edwin's convictions grow feverish, she must confront the faith of her past or risk losing the future she longs for.