Book excerpt: Seventeen-year-old Cardinal has escaped the virus that ravaged his town, leaving its victims alive but without their memories. He chooses to remain in the quarantined zone, caring for a group of orphaned kids in a mountain camp with the help of the former brutal school bully, now transformed by the virus into his best friend. But then a strong-willed and mysterious young woman appears, and the closed-off world Cardinal has created begins to crumble. A thrilling, fast-paced work of speculative fiction for teens, from a bestselling author, Black River Falls is an unforgettable story about survival, identity, and family.