Answer and explanation:
Nelly, Heathcliff and Catherine are characters in the famous novel "Wuthering Heights". Nelly is a servant who is telling the story of the wild, intense and violent love between Heathcliff and Catherine. At a certain point in the plot, Heathcliff wishes to contact Catherine via a letter and to see her when she is alone, but Nelly refuses to help at first. What causes Nelly to finally agree to deliver his letter is Heathcliff's threat of being violent to anyone who stands in his way. He convinces Nelly that, by helping him, she will be preventing others from being harmed. Nelly ends up acquiescing.
