The warrior cat Fireheart's determination to uncover the truth about another warrior's death leads him deep into danger, and reveals secrets that test the strength of clan loyalties.

After the warrior cat Clans settle into their new homes, the harmony they once had disappears as the clans start fighting each other, until the day their common enemy--the badger--invades their territory.

"Grandmother's attacks on the creatures of Bravelands come to a head"-- Bravelands is in turmoil. With Thorn dead, the animals of the plains desperately search for the next Great Parent, a role Prance is afraid to fill. Chase hides in plain sight amidst Grandmother's most loyal creatures, praying that the terrible antidote she's discovered will continue to hold the snake's power over her at bay. And Bramble finds himself up against a foe he couldn't...

Fireheart, the warrior cat, faces many challenges in his new role of ThunderClan deputy as his apprentice, Cloudpaw, resists following the warrior code, Bluestar weakens, and Tigerclaw continues to haunt the forest seeking revenge.

As a cold, harsh winter approaches, the cats from the mountains prepare to divide into several camps, requiring each cat to decide where his or her allegiances lie.

After facing their first battle, the remaining mountain cats must seek the Blazing Star in order to survive a new threat: a deadly disease sweeping through their territory.

When the bears return to Great Bear Lake for the longest day gathering, they find their reunion more challenging than they expected.

When the bears learn of the legendary Last Great Wilderness, a fabled bear paradise, they believe that this must be their ultimate destination.