When seventeen-year-old Tati sends a saliva sample to a DNA ancestry testing site, her results come back inconclusive. What’s wrong with her DNA? And does it have to do with her unexplained seizures and the beckoning tunnel she sees during them? What Tati discovers is more than she could have ever imagined possible. Parallel universes exist and her abnormal DNA compels and condemns Tati and her other selves—shy Ana, privileged Tatyana, and on-the-run Tanya—to a lifetime of ricocheting between their parallel lives in the multiverse. With knowledge of their existence a deadly threat in every universe, the only chance all four have to survive is to work together to take down the scientist responsible: their father.