Alex's sister Harriet has never done anything outrageous. She is much happier with her nose in a book or playing a board game. However, she decides to channel a braver version of herself, Harriet 2.0, when she has to fly to NYC for her sister's wedding. On the plane, she flirts with her super attractive row mate and ends up doing something she never thought she would: him, in the plane's bathroom. They'll never meet again and he isn't there when she gets back to her seat, but when she meets the best man she will be finishing up wedding tasks with, she is shocked to find out that Michael's married brother Luke is the man from the plane! She finds out that he is in the midst of a divorce but his family doesn't know, and they begin seeing each other in secret. Harriet 2.0 fully intends to go back to her 1.0 life after the wedding is done, so why not have some fun in the meantime?