Aurora is about to give birth and needs a place to stay. She's ready to give up when she finds a large empty cave beside a nice clear pond. She decides to give birth there, but soon discovers that shes not alone inside the cave. While there, Aurora meets Moonheart, the owner of the cave and fellow she-cat. The two become best friends and Moonheart teaches Aurora and her new children how to properly survive in the forest. Aurora soon learns that Moonheart comes from the life of a tribe, but she left to live on her own after her mate, Shadowtail, turned his back on her and broke her trust by disobeying the tribe's rules.
Moonheart helps Aurora raise her children and becomes a second mother to them, but Aurora's son, Rocket, has his eye on Moonheart. The orange tom wants to make her feel like she's loved. Rocket wants to be Moonhearts mate. Moonheart discovers this at the same time that Aurora gets sick with a fatal illness known as "Bloodcough." Now the 4 cats a