Twenty years ago, Jane Hudson left the Heart Lake School for Girls after a terrible tragedy. Now she has returned to the placid, isolated shores of the lakeside school as a Latin teacher, hoping to make a fresh start with her young daughter. But ominous messages from the past dredge up forgotten memories that will become a living nightmare. Since freshmen year, Jane and her room-mates, Lucy Toller and Deirdre Hall, were Inseparable -- studying, performing school girl rituals on the lake, and sneaking out after curfew to meet Lucy's charismatic brother Matt. However, the winter before graduation, three lives were taken, all victims of senseless suicide. Jane was left to carry the burden of a mystery that has stayed hidden for more than two decades. Now pages from Jane's missing journal, written during that tragic time, have re-appeared, revealing long-buried secrets. And suddenly, young, troubled girls are beginning to die again … as piece by piece the shattering truth slowly floats to the surface.