Shauna Macdonald

When passengers on a train are attacked by a creature, they must band together in order to survive until morning.  

Distraught, confused, and half-wild with fear, Sarah Carter emerges alone from the Appalachian cave system where she encountered unspeakable ...

After a tragic accident, six friends reunite for a caving expedition. Their adventure soon goes horribly wrong when a collapse traps them deep ...