Upset when Brenda comes home from University Day wanting to attend Northwestern, Mary anticipates an empty nest by demanding that Lester give her a job at the construction site --and gets fired on her first day. Mary takes a job at a travel agency (with Sandra), where her boss finds her so invaluable that he wants her to accompany him on a trip. The boss comes on to Sandra, who then quits and tells Mary not to go on the trip. She goes anyway, and Sandra then tells Lester about their boss. He surprises Mary in Philadelphia and jumps to the worng conclusions when he finds a man's suit and bathrobe in Mary's closet. He finds out that Mary bought them for him as a surprise. (thetvdb.com)