Kristy's stepfather has invited all the Baby-sitters to his family's cabin on beautiful Shadow Lake. At the lake there are boys, water skiing, kids to baby-sit for, and even a mystery.
When Stacey's friend from New York arrives, she can't believe Stacey is still into baby-sitting and sleepover parties. Stacey wonders if her friend is growing up faster than she is.
With the family thrown into a turmoil by the incessant crying of colicky, three-month-old Meredith, only twelve-year-old Case seems to notice that Meredith's baby sitter is behaving very oddly. Sequel to "Split Sisters.".