Whats a basic plot for Act 2 in Macbeth?

The scene continues in the inner court, as Lady Macbeth appears on stage and says that she has drugged the soldiers guarding Duncan's sleeping quarters. Macbeth comes back and tells his wife that he has done the foul deed. He also says that he fear's God's wrath, that he can no longer pray, and that a voice has said to him "sleep no more." She urges him to forget such "brain-sickly" things, and then scolds him for bringing the daggers used to kill Duncan with him, rather than leaving them beside the guards as she had planned. She departs to remedy this mistake. When she returns, they hear a knock on the castle door, but she says that they should ignore it and go to bed, thereby covering their crime.