Warriors (Erin Hunter). Original series

Fireheart, a full-fledged warrior cat, must confront questions of loyalty and identity as he faces the possibility of betrayal from within his own forest clan.

Fireheart's traitorous enemy Tigerclaw has been vanquished and exiled from ThunderClan -- but Fireheart can't shake the feeling that he's lurking out there in the forest, waiting for the chance to strike. That's not the only problem facing the young ThunderClan deputy in these blazing summer months, as he struggles to handle ominous omens, a disrespectful apprentice with a shocking secret, and a devastated Clan leader who is a shell of her former...

ThunderClan's darkest hour is upon them and Fireheart, the warrior cat, must protect his clan from a threat unlike any the forest has ever seen, as the time comes for prophecies to unfold and heroes to rise. ThunderClan's darkest hour is upon them, as Tigerstar's quest for power plunges all the Clans into the most terrible danger any cat has ever faced. In order to save his Clan and his friends, Fireheart must uncover the meaning of an ominous proclamation...