THE SOUND OF THUNDER continues the Courtney saga where WHEN THE LION FEEDS left off. Sean Courtney is off to fight the burghers in the Boer War -- first in harrowing missions on the front lines for the British Guides, then as the leader of commandos designed to fight the Boers on their own terms -- guerilla combat in the field. The peace that follows find Sean with hopes of marriage and settling down to farming. But the hatred borne by his twin brother will not allow a peaceful life. Garry, who has been forced to live in the shadow of his twin's superiority since childhood, has vowed to pay him back for the wrongs done him.