 Various authors have written works in the series, including Diana G. Gallagher and Paul Ruditis, who also co-authored two guidebooks, "The Book of Three" in 2004 and 2006.In 2015, HarperCollins acquired the rights to publish a second series of "Charmed" novels from CBS Consumer Products which owns the rights to the franchise.The first novel in this series, "The War on Witches", was published in May 2015, and the continuity of the narrative fits between the events of "" (2010–12) and "" (2014–16) in the comic book series.