Atonement

On a dark stormy night, four friends head out for a long overdue weekend away. After a car accident forces them to seek shelter, they find refuge in a cave, hidden beneath the roots of a large tree. It's only then that they realize that their past deeds need payment, and that there is something lurking in the dark, prepared to collect.

Atonement is Book 5 in T's Pocket Thrillers, a collection of thriller novellas that range from the psychological to paranormal. But beware, because all are aimed at making you fear what goes bump in the night.