Melissa Joy Boerger

Mercenaries with nothing to lose are hired to rescue a bioengineer imprisoned in a cold war bunker. Upon entering the ominous facility, they find themselves in a fight for their lives when they come under attack from an unknown and deadly creature.

Joshua must protect his twin sister, Emma, who possesses supernatural abilities and keep her safe from an unstoppable secret agent hunting them for an experiment in a classified government program.