It's 1987. It’s been thirty years since Dr. Van Barren mysteriously disappeared. But fifteen-year-old Marcy Mason thinks the answer resides in Van Barren’s secret laboratory, supposedly hidden somewhere in his abandoned mansion in the mountains of the Hudson Valley. On Halloween, Marcy and her friends, Skye Krause and Amanda Brooks, set out on a quest to find Van Barren’s laboratory. During the course of their journey, the girls come to terms with their own secret pasts and the uncertainties and insecurities of their emerging teenage years.