What happens in Act 4, Scene 1 in Romeo and Juliet?

In Act IV, Scene I, the Friar and Paris are talking about plans for the wedding. Friar asks Paris if Juliet is in love with him. Paris says that she has been so upset with the death of Tybalt that he has not had a chance to ask her. The reason for the haste is because of a depression she is in. Juliet enters and Paris goes to her and asks her if she has come for confession with the father. Paris tries to make her happier by bringing up their wedding on Thursday and when he sees he cannot, he excuses himself. Paris tells her that he will be looking forward to Thursday and departs.

Juliet and the Friar talk about her situation. The friar tells her that he has a plan. The friar gives her a drug and tells her that it will make it look like she has taken poison and committed suicide and she is to take it the night before her wedding. Juliet will then be put in her family vault. This drug will not kill her. The friar will go get Romeo and they both will come for her. Then she can leave and live her life with Romeo and no one would know.