Warriors - Thunder and Shadow Erin Hunter

The same rouges that attacked Skyclan follow clan cats back to the main territory and now Shadowclan might be next to fall. Alderpaw must save the clans from the rouges before it's too late...

THIS BOOK IS AMAZING. It's the second book in the last series - A Vision of shadows. It has three perspectives - Violetkit, Soon to be Violetshine (Of Shadowclan), Twigkit, soon to be Twigpaw (Of Thunderclan), and Alderpaw, Soon to be Alderheart (Also of Thunderclan). I strongly advise you read this book. (OOF technical words make me feel weird)