Seasons ago, Bluefur refused to give up her kits, and Thistleclaw became deputy in her place. Thistlestar leads his clan cruelly, greedy for land. In his territorial rage, he chases away and injures young kittypet Rusty. RiverClan rescues Rusty and accepts him into their clan, but while he just wants to learn the ways of his clan, he finds himself in the middle of a desperate war.

Whiskershadow, Skyflower, Moonfire, and Memoryclan has all been destroyed by Sanguis. They took everything form them. Their loved ones, mates, family members, their home. Now it's time to fight, until the sun dies!