They have always lived by the code, but only change can keep the peace. A new age is dawning on the warrior Clans. Now a new generation of warriors rises, one wrestling with the legacy of his great ancestor Firestar, one seeking to protect her troubled Clan, and one yearning to prove herself as a medicine cat, as leaders from all five Clans agree that the Warrior Code must be reformed. But when tragedy strikes RiverClan, old fears will threaten the...

"The warrior code now allows a cat to formally change Clans, but ShadowClan's newest arrival feels increasingly unwelcome--and though ShadowClan warrior Sunbeam thinks every cat deserves a chance, one of the loudest voices of opposition is her own mother. Meanwhile medicine cat apprentice Frostpaw scrambles to help RiverClan stay afloat under the watchful eye of a second Tigerstar, and the shadow of growing conflict looms over them all..."--

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.

"As a leaderless RiverClan faces disaster, its warriors and its young medicine cat apprentice are determined to protect their Clan and find its new leader--even if it means lying to the other Clans"--