After driving out WindClan for more hunting territory, ShadowClan tries to drive out ThunderClan, leading to a battle. Lionheart is killed during the fight, and Tigerclaw is named deputy. After this, Clawface of ShadowClan kills Spottedleaf and steals some ThunderClan kits. Everyone leads to suspect that it was Yellowfang who took the kits, considering she disappeared the moment they revealed Clawface's murder. Firepaw, along with Graypaw, follow Yellowfang's scent to ShadowClan territory, to find out the truth about Spottedleaf and the missing kits. Together, with some help from within ShadowClan, they drive out Brokenstar, the villainous leader of ShadowClan. Yellowfang, having proved her loyalty, becomes ThunderClan's new medicine cat, while Firepaw and Graypaw are made warriors and receive their warrior names, Fireheart and Graystripe.