With the speed of the great apes, Tarzan rushed through the jungle toward his home and family. But he was already too late. The marauders had been there before him. His farm was in shambles and no one was left alive. Of his beloved wife there was only a charred, blackened corpse, still wearing the rings he had given her. Silently, he buried the body and swore his terrible vengeance against those who had done this terrible deed. Then he set out grimly to track them --through warring armies -- across a vast desert that no man had ever crossed -- and to a strange valley where only madmen lived. 

I. Murder and Pillage
II. The Lion's Cove
III. In the German Lines
IV. When the Lion Fed
V. The Golden Locket
VI. Vengeance and Mercy
VII. When Blood Told
VIII. Tarzan and the Great Apes
IX. Dropped from the Sky
X. In the Hands of Savages
XI. Finding the Airplane
XII. The Black Flier
XIII. Usanga's Reward
XIV. The Black Lion
XV. Mysterious Footprints
XVI. The Night Attack
XVII. The Walled City
XVIII. Among the Maniacs
XIX. The Queen's Story
XX. Came Tarzan
XXI. In the Alcove
XXII. Out of the Niche
XXIII. The Flight from Xuja
XXIV. The Tommies

Hauptmann Fritz Schneider: German officer
Leutnant Obegatz: German officer under Schneider 
Unterleutnant von Goss: German officer under Obegatz 
Lady Greystoke: Jane Clayton, wife of Tarzan 
Tarzan of the Apes: John Clayton, Lord Greystoke 
Wasimbu: Muviro's son, Jane's bodyguard
Muviro: chief of Tarzan's Waziri warriors 
Fräulein Bertha Kirchner: German spy - aka Patricia Canby 
General Kraut: chief of German operations in East Africa 
Colonel Capell: British commander of the 2nd Rhodesians 
Major Preswick: British officer who knew Tarzan in London 
Major Schneider: brother of Fritz Schneider 
Usanga: Sergeant over the German East African blacks 
Naratu: Usanga's woman 
Go-Lat: king of an ape tribe 
Zu-Tag: Go-Lat's young rival 
Harold Percy Smith-Oldwick: Lt. flier in the Royal Air Service
Numabo: Chief of the Wamabo 
Xanila: sixty-year-old woman, captive in Xuja 
Herog: present king to Xuja 
Metak: Prince of Xuja, son of Hergo 
Lt. Thompson: Royal Air Service flier who finds Xuja 
Otobu: Wamabo slave in Xuja who befriends Tarzan