There are currently seven sub-series, each containing six books except for the seventh sub-series, which is currently in progress. The first, Warriors (later re-titled Warriors: The Prophecies Begin), was published from 2003 to 2004, and details the adventures of a housecat who joins one of the warrior cat Clans. Warriors: The New Prophecy, published from 2005 to 2006, follows the first sub-series, chronicling the Clans' journey to a new home. The third story arc, Warriors: Power of Three, was published from 2007 to 2009, and centres around a prophecy about three cats with extraordinary powers. The fourth sub-series, Warriors: Omen of the Stars, was published from 2009 to 2012 and continues the story arc of Warriors: Power of Three. The fifth sub-series, Warriors: Dawn of the Clans, was published from 2013 to 2015. This prequel series arc details the formation of the Clans. The sixth sub-series, Warriors: A Vision of Shadows, was published from 2016 to 2018. Chronologically, Warriors: A Vision of Shadows follows Warriors: Omen of the Stars. The seventh sub-series is entitled Warriors: The Broken Code. The first book in the seventh series, Lost Stars, was released on 9 April 2019. The second book, The Silent Thaw, will be released on 29 October 2019.