Rising Storm (Warrior Cats, Book 4) by Erin Hunter
Take another step into the wild with the Warrior Cats! Rejoin the adventures in book four of the series set in a thrilling feline fantasy world, when the forest is getting hotter and hotter...
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 self.
Meanwhile the forest gets hotter and hotter, and everyone braces for the coming storm.