Blood sisters

Solar morning Alison, her half -sister Kitty and Vanessa"s friend went to school. And an hour later a monstrous car accident occurred, in which Alison miraculously survived, but Vanessa died, and Kitty remained a heavy disabled person.
Now, fifteen years later, Kitty still cannot speak and suffers from memory in his memory, and the art teacher suffers Alison leads a quiet life and tries in vain to forget what happened that morning.
However, when Alison, despite fears, accepts the proposal to conduct courses for prisoners in a local prison, something strange and frightening begins to happen ...
behind her and her sister are monitored and threatened with anonymous notes.
Someone, hidden in the shade, is waiting and preparing to strike. Someone who knows well what happened many years ago