Three years later, Mr. Earnshaw dies, and Hindley inherits Wuthering Heights. He returns with a wife, Frances, and immediately seeks revenge on Heathcliff. Once an orphan, later a pampered and favored son, Heathcliff now finds himself treated as a common laborer, forced to work in the fields. Heathcliff continues his close relationship with Catherine, however. One night they wander to Thrushcross Grange, hoping to tease Edgar and Isabella Linton, the cowardly, snobbish children who live there. Catherine is bitten by a dog and is forced to stay at the Grange to recuperate for five weeks, during which time Mrs. Linton works to make her a proper young lady. By the time Catherine returns, she has become infatuated with Edgar, and her relationship with Heathcliff grows more complicated.When Frances dies after giving birth to a baby boy named Hareton, Hindley descends into the depths of alcoholism, and behaves even more cruelly and abusively toward Heathcliff. Eventually, Catherine's desire for social advancement prompts her to become engaged to Edgar Linton, despite her overpowering love for Heathcliff. Heathcliff runs away from Wuthering Heights, staying away for three years, and returning shortly after Catherine and Edgar's marriage.When Heathcliff returns, he immediately sets about seeking revenge on all who have wronged him. Having come into a vast and mysterious wealth, he deviously lends money to the drunken Hindley, knowing that Hindley will increase his debts and fall into deeper despondency. When Hindley dies, Heathcliff inherits the manor. He also places himself in line to inherit Thrushcross Grange by marrying Isabella Linton, whom he treats very cruelly. Catherine becomes ill, gives birth to a daughter, and dies. Heathcliff begs her spirit to remain on Earth-she may take whatever form she will, she may haunt him, drive him mad-just as long as she does not leave him alone. Shortly thereafter, Isabella flees to London and gives birth to Heathcliff's son, named Linton after her family. She keeps the boy with her there.Thirteen years pass, during which Nelly Dean serves as Catherine's daughter's nursemaid at Thrushcross Grange. Young Catherine is beautiful and headstrong like her mother, but her temperament is modified by her father's gentler influence. Young Catherine grows up at the Grange with no knowledge of Wuthering Heights; one day, however, wandering through the moors, she discovers the manor, meets Hareton, and plays together with him. Soon afterwards, Isabella dies, and Linton comes to live with Heathcliff. Heathcliff treats his sickly, whining son even more cruelly than he treated the boy's mother.Three years later, Catherine meets Heathcliff on the moors, and makes a visit to Wuthering Heights to meet Linton. She and Linton begin a secret romance conducted entirely through letters. When Nelly destroys Catherine's collection of letters, the girl begins sneaking out at night to spend time with her frail young lover, who asks her to come back and nurse him back to health. However, it quickly becomes apparent that Linton is pursuing Catherine only because Heathcliff is forcing him to; Heathcliff hopes that if Catherine marries Linton, his legal claim upon Thrushcross Grange-and his revenge upon Edgar Linton-will be complete. One day, as Edgar Linton grows ill and nears death, Heathcliff lures Nelly and Catherine back to Wuthering Heights, and holds them prisoner until Catherine marries Linton. Soon after the marriage, Edgar dies, and his death is quickly followed by the death of the sickly Linton. Heathcliff now controls both Wuthering Heights and Thrushcross Grange. He forces Catherine to live at Wuthering Heights and act as a common servant, while he rents Thrushcross Grange to Lockwood.