About Cat Castells Cat Castells is a contributing author of the Witch's Sun Sign Series. Books by Cat Castells Aries Witch Unlock the Magic of Your Sun Sign by (author) Ivo Dominguez & Diotima Mantineia contributions by Danielle Blackwood, Michael Cabrera, Cat Castells, Jack Chanek, Lilith Dorsey, Crow Walker, Dawn Aurora Hunt & Sandra Kynes