The year is 1940. Hitler's Germany is about to employ the secret arts of evil witchcraft to destroy Britain. Who can stop them?

It is the mission of John Graham, colonel in British Intelligence to stop the onslaught of evil with an extraordinary strategy that defies all the rules of twentieth-century warfare. Unite the different witches' covens throughout England, drawing upon powers that reach back through dark centuries, in a ritual of awesome sacrifice on the first night of August, the magical Lammas Night.