The hill

Lindsay, Kat, Sarah and Haven have been best friends for as long as they can remember. They consider themselves as sisters. They couldn't believe their luck when they got a job at an old woman's library for the summer, located at the end of a deserted hill.
Strange stories were told about 'the hill' but it was never a problem for the girls because they didn't believe the stories. Not until they became part of the strange stories and lost one of their friends...