From the back cover:
THE HERO WARS BEGIN IN DRAGON PASS
You are heroes of the Red Cow clan, from the Cinsina tribe, of the Jonstown Confederation in the kingdom of Sartar. Fend off Chaos, werewolves, other tribes, and more in this epic campaign that takes your heroes from the depths of the Occupation of the kingdom of Sartar by the Lunar Empire in 1618 through to the Liberation of the kingdom in 1625.
The campaign in this book has a year-by-year outline for events for the Red Cow clan and Dragon Pass for those years. Included are twenty complete adventures set in that exciting period, along with many more adventure seeds. The adventures feature two complete heroquests, including a quest to the Underworld and Sky that will result in your PCs changing the world.
THIS IS NOT A STANDALONE BOOK!
This book is a companion to The Coming Storm which details the setting in which the adventures here take place: The Red Cow clan and their neighbors. It is intended for use with that product. It requires the use of the HeroQuest Glorantha rules.