Being a twin has its perks (especially when your twin is a boy). This year, Willow and Winston are holding their first ever co-ed birthday party, and everyone in class is invited. Thismeans Win's cute friend Jacob is on the guest list. Willow's pumped that her crush will be coming over and gets the Sleepover Girls to help her plan a party that's all kinds of awesome! But even the best-laid plans can go awry. Jacob seems tolike Ashley, and mean girls Franny and Zoe are driving Willow nuts. Can the birthday girl pull it together and throw a memorable party, or will her birthday be a complete bust?