Fireheart's traitorous enemy Tigerclaw has been vanquished and exiled from ThunderClan--but Fireheart can't shake the feeling that he is lurking in the forest, waiting for a chance to strike. In the heat of a blazing summer, Fireheart struggles to handle sinister omens, an apprentice with a shocking secret, and a devastated Clan leader who is a shell of her former self. And as the forest gets hotter and hotter, every cat braces for the coming storm....