Shattered Sky — Erin Hunter

ShadowClan has fallen. A group of rogues now rules the pine forest, and their cruel leader, Darktail, will not stop until he has conquered the rest of the Clans. Alderheart is more certain than ever that their only hope is to find the lost SkyClan and fulfill StarClan's prophecy before Darktail's vicious reign puts an end to the warrior Clans forever.

Full of epic adventure and thrilling intrigue, this fifth Warriors series is the perfect introduction for readers new to the Warriors world while for dedicated fans, it's a long-awaited return to the era of Bramblestar's ThunderClan, after the events of Omen of the Stars.