New York Times best-selling author of the Delirium trilogy, Lauren Oliver, writes an epic novel using unique formatting in a “flip book,” the first in a duology. To access the two compelling narratives, the reader can alternate chapters to access the mirrored scenes by flipping over the book, or read the stories separately. Lyra, a Replica or clone, uneducated, inquisitive and naive, escapes her home, a mysterious research facility called Haven, and along with 72, a male engineered teen, discovers a strange world beyond the Institute. Self-conscious, insecure loner Gemma becomes embroiled in a conspiracy about Haven and the clones as she tries to discover her father’s secret involvement, in a mystery that revolves around untangling the web of lies that surround Haven and questions the ethics of human cloning. Multiple twists, exciting revelations by each of the dynamic protagonists, a touch of romance and an open-ended conclusion, make this innovative science fiction yet complex contemporary tale an engaging and entertaining read.