Lady Macbeth Act 1, Scene 7

Lady Macbeth's role in this scene is to persuade her husband. He is starting to feel uneasy about the murder, but she successfully brings confidence back to him. She tells him her plan in detail so that Macbeth can build his nerve. She is certain that the drunken guards will take the fall for the murder and the two of them will get away with the evil deed. Judging by the phrase, "What beast was't then that made you break this enterprise to me," it as though Lady Macbeth wants her husband to be an evil being. She sees the two of them carrying out evil acts together, and nothing more pleases her.