In Edgar Rice Burroughs' seventh book about ape-man Tarzan, World War I rages through East Africa. While away in Europe fighting for England, Tarzan is unaware of the evil descending upon his plantation in British East Africa. When he returns, it is too late. German colonial forces have ransacked and destroyed his entire home, leaving nothing but disaster behind. In the wreckage, Tarzan finds the charred, blackened corpse of his beloved wife Jane. Consumed with grief and thoughts of vengeance, he sets out to wage a bloody guerilla war against all Germans troops that stand in his way on his path to ultimate revenge on German officer Captain Fritz Schneider. Will Tarzan succeed through harsh desert and wasteland with the help of his untraditional army of gorillas and lions?