Mariella Adams wakes each day with a strange electric energy under her skin—symptoms she fears are the first signs of her late mother’s mental illness. When she finds her mother’s journals, including an entry written after her death, Mariella becomes desperate for answers. Everything changes when two strangers, Rose and Parker, reveal they’re time travelers who need her help to restore Parker’s lost ability to time travel. Though they’re forbidden from interfering with the past—or with her—they may be the key to uncovering her mother’s secrets. As Mariella grows closer to Parker, she races to unravel the truth about her own past and his future. But time is running out, and she must solve the mystery before Parker disappears from her timeline forever.