Brook offers to pay Falstaff to woo Mistress Ford. Ford explains that he loves her but dares not approach her because she has a reputation to uphold as a married woman. Falstaff, of course, accepts the assignment. After all, there's money to be made. Then he tells Brook that he has already scheduled a tryst with Mistress Ford, noting the day and the hour.
Brook makes a mental note.
A knock at the door disrupts their intimacy. It is Mistress Page. Mistress Page enters. Then, speaking loudly enough for Falstaff to hear, she says word is out that Mistress Ford is entertaining a man. What the women do not realize is that Mr. Ford really is on his way to the house with Mr. Page and other citizens including Doctor Caius and Sir Hugh Evans to ensnare Falstaff and Mistress Ford.