For generations, four clans of wild cats have shared the forest. When their warrior code is threatened by mysterious deaths, a house cat named Rusty may turn out to be the bravest warrior of all.

"In a leaderless RiverClan, medicine cat apprentice Frostpaw is desperate to guide her Clanmates down the right path--while Tigerstar watches their every move. Within ShadowClan and ThunderClan, the changes to the warrior code stretch tempers to the tipping point, where one wrong move could prove that peace among the Clans can never last for long."--

"When a storm-tossed river sweeps Ripple away from the park he's always known, he commits himself to the life of a peaceful loner. Still, as his new island home starts to become a sanctuary for other rogues, he can't help but feel responsible for their safety, and for the community--and Clan--they are beginning to build. But when an old friend from the park resurfaces with terrible news just as the forest cats' fights begin to escalate into bloodshed,...

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.

While Frostpaw takes refuge in ShadowClan as Splashtail seizes control of her home, Nightheart returns to ThunderClan and to a complicated reunion with his mate Sunbeam whose efforts to fit in as ThunderClan's newest member are hampered by her treacherous mother.