Warriors: The Hidden Clans

Spencer had been a stray cat defending for himself most of his life. Now he has to take on a whole new world as a strange and huge cat takes him deep within the forest where four clans of wildcats take place. He's soon renamed Sparrowpaw and becomes one of the most phenomenal cats in his Clan.
But Vastclaw suspects him of killing a previous clan-mate and reports it to the leader.
How will Sparrowpaw re-earn his clans trust when he's no more than an outsider? And turns out, there's deeper secrets to what happened to their former-clan mate...