Erin Hunter's #1 nationally bestselling Warriors series continues in Warriors: Omen of the Stars-now featuring fierce new art. The fourth book in this fourth series, Warriors: Omen of the Stars #4: Sign of the Moon, brings more adventure, intrigue, and thrilling battles to the epic world of the warrior Clans.

As the dark forces that have come between the four warrior Clans grow stronger, Jayfeather is summoned to the mountains by a desperate plea-the Tribe of Rushing Water is on the brink of being lost forever.

• An Ancient Prophecy: A darkness is rising, and three cats of ThunderClan are the only hope. In this fourth book of the Omen of the Stars arc, the fate of all the Clans hangs in the balance.
• A Medicine Cat’s Quest: When the Tribe of Rushing Water sends a desperate plea for help, Jayfeather must leave his Clan behind and journey into the unforgiving mountains.
• The World of the Warrior Clans: Delve deeper into the rich world of the four warrior Clans, where loyalty is tested, the warrior code is law, and every moon brings a new adventure.
• High Stakes Adventure: Perfect for middle grade readers who love epic quests, this story is packed with the intrigue and action that have made the Warriors series a #1 bestseller.