Erin Hunter 
Warriors: A Starless Clan #1: River 

A thrilling new adventure begins in Erin Hunters #1 bestselling Warriors series!They have always lived by the codebut only change can keep the peace.A new age is dawning on the warrior Clans. Now a new generation of warriors risesone 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 catas leaders from all five Clans agree that the Warrior Code must be reformed.But when tragedy strikes River Clan, old fears will threaten the new peace unless these three young cats can calm the coming storm.This seventh epic Warriors series is full of action, intrigue, and adventure. This first book is the perfect introduction for new readers, while long-time fans will discover what unfolds after the events of The Broken Code.