When the Lion Feeds
by Wilbur Smith
The novel begins in Natal in the 1870s, with the introduction of twin brothers Sean and Garrick, the sons of ranch owner Waite Courtney. After one of Sean's hunting accidents results in Garrick losing his leg, a guilt-ridden Sean becomes Garrick's protector, with Garrick later manipulating Sean's guilt for his own benefit. Sean and Garrick are both expelled from school after Sean assaults a teacher who attacked Garrick in order to antagonize Sean, after which Waite hires the two to work for him.
Sean, Garrick and Waite all participate in the Anglo-Zulu War. Waite is killed in battle, and Sean is later presumed dead after getting caught in an ambush. Garrick meanwhile becomes a war hero after inadvertently preventing the Zulus from forcing their way into a makeshift hospital ward, earning the Victoria Cross for his efforts.
Upon learning that Sean's girlfriend Anna is pregnant, Garrick marries her to prevent her giving birth out of wedlock. The two fail to consummate their marriage due to Garrick proving to be impotent, and when they return, Sean is revealed to have survived after escaping the ambush and subsequent pursuit with the help of Mbejane, a Zulu who turned against his people after his father was murdered by supporters of Cetewayo. Anna tries to return to Sean, but he refuses her due to her marriage to Garrick, even after learning that she bears his child. A bitter Anna fakes being raped by Sean, turning Garrick against his brother, though Sean assumes that she told Garrick the truth of her pregnancy.
Sean and Mbejane travel north, where they meet Duff Charleywood, an assistant mining engineer. After learning of the discovery of gold on the Witwatersrand, Sean and Duff agree to pool their resources to make their fortunes in the subsequent gold rush. Buying land off of Candy Rautenbach, a hotel owner who Duff becomes engaged to, the pair soon establish a profitable gold mine for themselves and become millionaires. Before long the pair are two of the wealthiest individuals on the Witwatersrand, second only to jewish diamond tycoon Norman Hradsky and his business partner Max, the former of whom Duff pursues a personal rivalry with owing to Hradsky's similarities to his overbearing father.
Despite this antagonism, Sean, Duff and Hradsky work together for mutual profit, setting up a stock exchange in Johannesburg alongside the other mine owners, and eventually merging their companies into a single enterprise, Central Rand Consolidated. During this time Sean gradually loses his moral compass, helping to drive another entrepreneur to financial ruin and suicide, and later forcing Mbejane to wear a livery.
He returns to normal after being trapped in a cave-in and saved by his workers, during which time he resolves never to hurt another if he can help it. Duff deserts Candy the morning before their wedding, fearing it will just be a repeat of his miserable first marriage, and returns to the Witwatersrand a few months later. Shortly afterwards, Sean and Duff are tricked out of their CRC shares and fortunes by Hradsky (albeit by using their own greed against them), and Sean decides to leave Johannesburg.
Sean, Duff and Mbejane travel into the Bushveld to hunt for ivory. During this time, Duff is bitten by a rabid jackal and contracts rabies, eventually forcing Sean to euthanize him. After grieving for his friend, he encounters the Lerouxes, an Afrikaner family also hunting in the Bushveld, and falls in love with their youngest daughter, Katrina. The pair of them later marry and have a child, who they name Dirk Courtney.
Shortly afterwards, Katrina contracts black water fever, and Sean travels back to Johannesburg to enable her to recover. While there however, Katrina gmistakenly assumes that Sean misses his old life there, and wrongfully suspects Candy to be a mistress of Sean's after seeing them interact with one another. Considering herself a failure as a wife, she commits suicide. Though affected by his grief, Sean resolves to keep living for Dirk's sake, and he heads back into the Bushveld to collect enough ivory to pay for a farm, as he and Katrina had talked about doing.