Into the Wild is a fantasy novel about the lives of fictional cats, written by a team of authors using the pseudonym Erin Hunter. The novel was published by HarperCollins in Canada and the United States in January 2003, and in the United Kingdom in February 2003. It is the first novel in the Warriors series. The book has been published in paperback, and e-book formats in twenty different languages. The story is about a young domestic cat named Rusty who leaves his human owners to join a group of forest-dwelling feral cats called ThunderClan, adopting a new name: Firepaw. He is trained to defend and hunt for the clan, becomes embroiled in a murder and betrayal within the clan, and, at the end of the book, receives his warrior name, Fireheart, after a battle with another clan. He must face t