From the back cover:
JOIN THE HEROES OF THE RED COW
In Sartar, the Red Cow clan are surrounded by their enemies and occupied by the Lunar Empire. To their south the Culbrea tribe cast greedy eyes on the clan’s cows, to the north the treacherous Dinacoli seek vengeance for old wounds, and to the east the monstrous Telmori, a tribe of werewolves listen to a new leader, Jogar Sog, who calls on the wolfmen to slaughter their neighbors. The winds that bring the Hero Wars are blowing, can your heroes see your clan through The Coming Storm?
The Coming Storm is the guide to the Glorantha setting of the Red Cow clan in Sartar. With over 60 detailed and illustrated NPCs, write-ups of all major locations, maps, history of the Cinsina, and details of the neighbouring Dolutha, Two Pine, and Emerald Sword clans. Also covered are the Telmori werewolves, Wulfsland settlers, local rebel leaders and the ghouls of the Woods of the Dead. This book provides everything you need to run a classic clan-based Sartarite campaign.
The Coming Storm forms the setting for the forthcoming The Eleven Lights an epic campaign taking the Red Cow through the opening days of the Hero Wars from 1618-1625.