From the back of the book:
Maelstrom Domesday is the new incarnation of Maelstrom, the classic RPG from 1984. The core rulebook contains everything needed to play, but this players guide is the perfect introduction and reference to both the rules and the setting.
Offering a commentary view on character creation, the game rules, magick and religion, this book will help a completely new player quickly master the game rules. The included complete setting guide will prove an invaluable reference either before or during play to the world of 1086. All in all, this book is an easy read and a perfect companion volume for any player.
This book does require the Maelstrom Domesday RPG bbok to use as it does not in itself contain any of the rules.