Acornpaw's dreams of becoming a fully fledged warrior with her sister are crushed when her training is delayed due to the quest. Two cats from each clan have been chosen to find the six lost clans: Mountainclan, Marshclan, Treeclan, Earthclan, Lakeclan, and Amberclan, each clan forgotten and lost from any other clans. When Acornpaw is chosen, she has two choices: to give up her training for months to save the lost clans or to stay and forget about the lost clans forever.