The wild cats of the forest have lived in peace and harmony for many moons -- but a doom that will change everything is coming. Strange messages from their warrior ancestors speak of terrifying new prophecies, danger, and a mysterious destiny.
All the signs point to young warrior Brambleclaw as the cat with the fate of the forest in his paws. But why would the son of wicked cat Tigerstar be chosen to be a hero? And who are the other cats mentioned in the prophecy? All Brambleclaw knows for sure is that the strength and courage of the greatest warriors will be needed now, as the quest to save the Clans begins.

Several Moons have passed since six cats set out from the forest on an urgent journey to save all their Clans. Now those six are traveling home again, but on their way through the mountains, they meet a tribe of wild cats who seem to have their own set of warrior ancestors... and their own mysterious prophecy to fulfill. Stormfur can't understand their strange fascination with him, but he knows the danger they face is real.
Meanwhile, back in the forest, Firestar's daughter Leafpaw watches ThunderClan's world crumble around her, as the humans' terrible machines destroy more and more of their home. Will the questing cats make it back in time to save the Clans, or will they be to late?

Something terrifying is happening in the world of the Clans. Amidst the destruction of the forest, cats are disappearing, including ThunderClan's beloved medicine cat apprentice, Leafpaw. Now the young cats who set off on a quest many moons ago have returned with a chilling message: The Clans must move to a new home, or risk extermination.
But it is not easy to convince the cats to leave. Even if all four Clans agreed to travel together, the dangers waiting for them beyond their borders are impossible to predict. More importantly, even the questing cats have no idea where they're supposed to go. What they need is a sign from StarClan... but what they need most of all is a plan to save their missing warriors, or risk leaving them behind forever.

Before there is peace, blood will spill blood...
The Clans have finally arrived in their new home, following the prophecies of their warrior ancestors. The journey was difficult enough, but now they must struggle to establish territories and learn the hidden dangers of this unfamiliar world. Most importantly, Leafpaw knows they must find a replacement for the Moonstone -- a place to communicate with StarClan. Otherwise there will be no way to choose new leaders, no way to share medicine cat secrets, and no way to know whether the Clans are on the right path.
The future seems uncertain, and more than one cat is harboring sinister plans that could lead to violence and darkness. As all the warriors wait for a sign, some of them begin to realize that the threats they face in the forest may not be as perilous as the threats they face from within....

Before there is peace, blood will spill blood...
New territory brings new troubles for the fierce cats of the warrior Clans, who are still uncovering the secrets of their new home around the lake. Dangers they have never faced before are lurking in the twilight shadows, and former allies are acting strangely hostile.
As divisions between the Clans grow deeper, Firestar's daughters face troubling decisions. One is torn between loyalty to her calling and a forbidden love, while the other struggles with her best friend's betrayal and the surprising perils of the forest. The choices they make now could affect ThunderClan for generations to come... and with an unexpected enemy preparing to attack, their courage and strength will be needed more than ever if the Clan is to survive.

Soon after the cats reached their new home by the lake, ThunderClan's medicine cat Leafpool received an ominous warning from StarClan: Before there is peace, blood will spill blood, and the lake will run red. As the Clan slowly recovers from a devastating badger attack, Leafpool can't help but wonder...do her prophetic dreams mean there are even worse dangers still in store for the warrior cats?

At the same time, shadows of the past continue to haunt the forest as some old friends struggle to find their place, others appear to be lost forever, and an old enemy finds a new way to resurface in a quest for dark revenge. A sinister path is unfolding, and the time is coming for certain warriors to make the choice that will determine their destiny...and the destiny of all the Clans.