From Erin Hunter, #1 nationally bestselling author of Warriors, comes the New York Times bestselling second book in the Survivors series. Praised by Kirkus Reviews as "perfectly crafted" in a starred review, A Hidden Enemy is an action-packed adventure that will thrill fans of Spirit Animals and Wings of Fire. After discovering a forest filled with prey and fresh water, Lucky and the Leashed Dogs are sure that they have found their new home...