The Hostage of Vampire Valley

Forced to move to Montana with her parents' murderers, half-mad Maggie climbs the walls of her home at night, only to discover blood-spitting vampires trapped in vats on her roof. A lover helps her discover her powers, and the two brave severe attacks to save her brother and fly hordes of trapped vampires in vats through fire and smoke to imprisonment in a mountain, only to be trapped themselves.