Warriors is a series of fantasy fiction books written by Erin Hunter. The series is about the adventures of wild cats as they try to survive in their forest homes. The series is made up of four mini-series with six books in each series. The first of these, called "Warriors", was released in 2003, starting with the book "Into the Wild". The authors were not planning to write another mini-series, but they eventually began the second mini-series. The second mini-series is titled "Warriors: The New Prophecy" and was published in 2005. The first book was called "Midnight". The first book of the third series "Warriors: The Power of Three", "The Sight", was released on April 24, 2007. The fourth series, "Warriors: Omen of the Stars", began with "The Fourth Apprentice"