Erin Hunter 
Warriors: Code of the Clans [EPUB ebook] 

The secrets behind the warrior code will finally be revealed. An ominous sign from Star Clan that signaled the need to patrol borders The unexpected help from a warrior ancestor that cemented the importance of elders A secret coup that led to a deputy’s new role A medicine cat’s pleas that stopped a spree of inter Clan bloodshed and many more never-before-told stories!