Winter Games (Camp Confidential #12) by Melissa J. Morgan
Presidents' Weekend is coming up, and Tori's parents have invited four of her closest friends to their Tahoe home for a ski trip! No sooner have the girls booked their tickets to California than they learn that the Lakeview reunion is also scheduled for that weekend. Will the fourth years be separated for reunion weekend?
Dog Gone note: This can read as a stand alone, despite it being a part of a series.