Edgar's health continues to fail over the following week. Though she doesn't want to leave her sick father alone, Cathy rides with Nelly to see Linton on the moors. Linton is even more nervous during this meeting than the last one, and admits that his father is pushing him to woo Cathy. He also says that he's frightened of what Heathcliff would do to him if she doesn't marry him.
Heathcliff's desire for revenge is so great that his own son fears what Heathcliff might do to him if he fails to help Heathcliff get what he wants.
As they talk, Heathcliff arrives. He asks Nelly that Edgar's health, and also tells her privately that he worries that Linton will die before Edgar does. Heathcliff then asks Cathy and Nelly to return to Wuthering Heights with him. Cathy tells him that she is forbidden by her father to go to Wuthering Heights, but agrees to go anyway because Linton is terrified to return to the house without her.
Linton's weakness is what most seems to attract Cathy. Just as when she first met him in chapter 6, what she most likes to do is to mother him. Their relationship is one that seems almost founded on its inequality.
At Wuthering Heights, Heathcliff locks Nelly and Cathy inside the house and says that they won't be allowed to leave until Cathy and Linton marry. He locks Nelly and Cathy in a bedroom that night. The next day he lets Cathy out of the bedroom (but not out of Wuthering Heights) and keeps Nelly locked in the room under the guard of Hareton. This continues for five days.
Note the parallels between Heathcliff's actions here and the time he was locked in an attic by Hindley. Revenge continues to cause events to almost exactly repeat themselves.