A GOTHIC AND ELEGANT PAGE-TURNER.-The Boston GlobeTwenty years ago, Jane Hudson fled the Heart Lake School for Girls in the Adirondacks after a terrible tragedy. The week before her graduation, in that sheltered wonderland, three lives were taken, all victims of suicide. Only Jane was left to carry the burden of a mystery that has stayed hidden in the depths of Heart Lake for more than two decades. Now Jane has returned to the school as a Latin teacher, recently separated and hoping to make a fresh start with her young daughter. But ominous messages from the past dredge up forgotten memories. And young, troubled girls are beginning to die again-as piece by piece the shattering truth slowly floats to the surface. . . .