Tarzan and the Tarzan Twins, with Jad-Bal-Ja, the Golden Lion
written by Edgar Rice Burroughs

Tarzan of the Apes is a novel written by Edgar Rice Burroughs, the first in a series of books about the title character Tarzan. It was first published in the pulp magazine All-Story Magazine in October, 1912; the first book edition was published in 1914. So popular was the character that Burroughs continued the series into the 1940s with two dozen sequels. The novel tells the story of John Clayton, born in the western coastal jungles of equatorial Africa to a marooned couple from England, John and Alice Clayton, Lord and Lady Greystoke. Adopted as an infant by the she-ape Kala after his parents died, Clayton is named "Tarzan" and raised in ignorance of his human heritage. Feeling alienated from his peers due to their physical differences, he discovers his true parents' cabin, where he first learns of others like himself in their books, with which he eventually teaches himself to read. On his return from one visit to the cabin, he is attacked by a huge gorilla which he manages to kill with his father's knife, although he is terribly wounded in the struggle. As he grows up, Tarzan becomes a skilled hunter, exciting the jealousy of Kerchak, the ape leader, who finally attacks him. Tarzan kills Kerchak and takes his place as "king" of the apes. Later, a tribe of black Africans settles in the area, and Kala is killed by one of its hunters. Avenging himself on the killer, Tarzan begins an antagonistic relationship with the tribe, raiding its village for weapons and practicing cruel pranks on them. They, in turn, regard him as an evil spirit and attempt to placate him. Subsequently, a new party of whites is marooned on the coast, including Jane Porter, the first white woman Tarzan has ever seen. Tarzan's cousin, William Cecil Clayton, unwitting usurper of the ape man's ancestral English estate, is also among the party. Tarzan spies on the newcomers, aids them in secret, and saves Jane from the perils of the jungle. Absent when they are rescued, he is introduced further into the mysteries of civilization by French Naval Officer Paul D'Arnot, whom he saves from the natives. D'Arnot teaches Tarzan French and how to behave among white men, as well as serving as his guide to the nearest colonial outposts. Ultimately, Tarzan travels to Jane's native Baltimore, Maryland only to find that she is now in the woods of Wisconsin. Tarzan finally meets Jane in Wisconsin where they renew their acquaintance and he learns the bitter news that she has become engaged to William Clayton. Meanwhile, clues from his parents' cabin have enabled D'Arnot to prove Tarzan's true identity. Instead of claiming his inheritance, Tarzan chooses rather to conceal and renounce his heritage for the sake of Jane's happiness.

The novel picks up where Tarzan of the Apes left off. The ape man, feeling rootless in the wake of his noble sacrifice of his prospects of wedding Jane Porter, leaves America for Europe to visit his friend Paul d'Arnot. On the ship he becomes embroiled in the affairs of Countess Olga de Coude, her husband, Count Raoul de Coude, and two shady characters attempting to prey on them, Nikolas Rokoff and his henchman Alexis Paulvitch. Rokoff, it turns out, is also the countess's brother. Tarzan thwarts the villains' scheme, making them his deadly enemies. Later, in France, Rockoff tries time and again to eliminate the ape man, finally engineering a duel between him and the count by making it appear that he is the countess's lover. Tarzan deliberately refuses to defend himself in the duel, even offering the count his own weapon after the latter fails to kill him with his own, a grand gesture that convinces his antagonist of his innocence. In return, Count Raoul finds him a job as a special agent in Algeria for the ministry of war. A sequence of adventures among the local Arabs ensues, including another brush with Rokoff. Afterward Tarzan sails for Cape Town and strikes up a shipboard acquaintance with Hazel Strong, a friend of Jane's. But Rokoff and Paulovitch are also aboard, and manage to ambush him and throw him overboard. Miraculously, Tarzan manages to swim to shore, and finds himself in the coastal jungle where he was brought up by the apes. He soon rescues and befriends a native warrior, Busuli of the Waziri, and is adopted into the Waziri tribe. After defeating a raid on their village by ivory raiders he becomes their chief. The Waziri know of a lost city deep in the jungle, from which they have obtained their golden ornaments. Tarzan has them take him there, but is captured by its inhabitants, a race of beast-like men, and condemned to be sacrificed to their sun god. To his surprise, the priestess to perform the sacrifice is a beautiful woman, who speaks the ape language he learned as a child. She tells him she is La, high priestess of the lost city of Opar. When the ceremony is fortuitously interrupted, she hides him and promises to lead him to freedom. But the ape man escapes on his own, locates the treasure chamber, and manages to rejoin the Waziri.

Not long after Tarzan claims his hereditary title of Lord Greystoke and marries Jane, their infant son, Jack, is kidnapped in London by his old Russian enemies, Nikolas Rokoff and Alexis Paulvitch. Following an anonymous call about the whereabouts of Jack, Tarzan himself falls into Rokoff's trap and is imprisoned aboard a ship carrying Jack. Jane, fearing Tarzan was entering a trap, follows him and also finds herself in Rokoff's clutches aboard the boat. Rokoff sets sail to Africa, eventually exiling Tarzan on an island near the African coast and telling Tarzan that Jack will be left with a cannibal tribe and raised as one of their own. Using his jungle skill and primal intelligence, Tarzan wins the help of Sheeta, the vicious panther, a tribe of great apes led by the intelligent Akut, and the native warrior Mugambi. With their aid, Tarzan reaches the mainland, kills Rokoff, and tracks down his wife and son. Paulvitch, the other villain, is presumed dead, but manages to escape into the jungle.

Alexis Paulvitch, a henchman of Tarzan's now-deceased enemy, Nikolas Rokoff, survived his encounter with the ape-man in The Beasts of Tarzan and wants to even the score. Paulvitch lures Jack, Tarzan's son, away from London and into his clutches, but Jack escapes with the help of the ape named Akut. Akut & Jack flee into the deep African jungle where two decades earlier Tarzan himself had been raised. The young Jack Clayton, now on his own, becomes known as Korak the killer and builds a reputation for himself in the Jungle. Korak, like his father before him, finds his own place in the Jungle among the great apes, and also like his father, meets and rescues a beautiful young woman, Meriem. Meriem is the daughter of a Captain in the French Foreign Legion, who was also a Prince (Prince de Cadrenet), named Armand Jacot.