Warriors (Erin Hunter). Dawn of the clans

"For many moons, a tribe of cats has lived peacefully near the top of a mountain. But prey is scarce and seasons are harsh--and their leader fears they will not survive. When a mysterious vision reveals a land filled with food and water, a group of brave young cats sets off in search of a better home. But great dangers await them. In this unfamiliar world, faced with loners and fierce rogues all vying for territory and power, the traveling cats must...

A latest entry in the prequel story arc reveals new details about the history of the warrior cats and follows the efforts of Clear Sky to violently divide the territories of the forest cats in spite of Gray Wing's efforts to promote peace.

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.