<P> This decision can be regarded as the beginning of Heathcliff's revenge on the Lintons . He later returns, a wealthy and distinguished gentleman, to find Cathy married to Edgar and living at Thrushcross Grange . The moment of his return is a telling one . After Cathy runs outside to greet him, </P> <P> Mr. Linton walked to a window on the other side of the room that overlooked the court . He unfastened it, and leant out . I (Nelly) suppose they were below, for he exclaimed quickly: "Don't stand there, love! Bring the person in, if it be anyone particular ." Ere long, I heard the click of the latch, and Catherine flew up - stairs, breathless and wild; too excited to show gladness: indeed, by her face, you would rather have surmised an awful calamity . </P> <P> In an awkward set of visits to the Grange, Heathcliff begins to exact his revenge, seducing Isabella Linton in order to gain control of Thrushcross Grange at Edgar's death, and trapping her in an abusive and terrifying marriage . Cathy falls into a state of psychological insanity, although it is partly feigned in her desire to provoke her husband and "break his heart" because of the pain that she feels . Soon she refuses to eat, never leaves her chamber, and falls prey to countless delusions and declarations of madness . </P> <P> It's a rough journey, and a sad heart to travel it; and we must pass by Gimmerton Kirk to go that journey! We've braved its ghosts often together, and dared each other to stand among the graves and ask them to come . But, Heathcliff, if I dare you now, will you venture? If you do, I'll keep you . I'll not lie there by myself: they may bury me twelve feet deep, and throw the church down over me, but I won't rest till you are with me . I never will! </P>

What illness did catherine have in wuthering heights