Gillian Andrews is the author of the Interstellar Enforcement Agency trilogy. Supershell storm is a stand-alone interquel set in the Major Shells universe. It begins six months after the end of the third book in the Interstellar Enforcement Agency trilogy, Exceptional Point, and features many of the same characters. Gillian Andrews is also the author of the award-winning Ammonite Galaxy series, and the stand-alone novel Kelfor.