Luke Rutherford is your average teenager – until his dead father's best friend, Rupert Galvin, turns up. Galvin has come to tell Luke his secret destiny: he's the real-life great-grandson of Abraham Van Helsing, the vampire hunter in Bram Stoker's Dracula. Luke is set to inherit the family mantle as a warrior against the supernatural entities swarming the earth. Unfortunately, powerful Half-Life, Gladiolus Thrip (Mackenzie Crook) is standing in his way.

Galvin lets his emotions get the better of him when his wife's murderer, Mr Tibbs, arrives in town. Hell-bent on revenge and with no regard for his own safety, Galvin arms himself to the teeth and embarks on what amounts to little more than a suicide mission. The problem is, his thirst for vengeance leads him straight into rat-man's trap, putting more than his own life at risk.