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.

Six-year-old Madge might think her sister has been ‘taken up to heaven by an angel’ but Galvin suspects otherwise. Everything points to half-life involvement and he thinks it’s the perfect project for Luke. A visit to zombie priest, Father Simeon (guest star Richard Wilson) confirms Galvin’s suspicions. Gilgamel is no angel – he’s a demon, a travesty demon, a Type 9 entity attracted by the odour of sanctity. Can Luke rise to the challenge?

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.

When a bad boy vampire arrives on the scene and Mina starts behaving strangely, Galvin gets suspicious. Mina confesses that Quincey is back. He has come for her – he wants her to give in to her half-blood heritage. Galvin reassures her that he, of all people, understands – but they both know that sentiment has no place in the smiting game. One thing’s for sure - a battle of epic proportions is in the offing…

Mina and Galvin's investigation of a murder lead them to believe that Luke is in danger. Whilst Luke is lying low Mina starts having visions of a winged beast; Galvin and Ruby are concerned that Luke's new love interest is a low life who had taken the form of a beautiful female to trick its prey.

Luke becomes haunted by dreams about the car crash that killed his father and Galvin's connection to it. A visit to a psychic convinces him his godfather is not the man he seems and, with Gladiolus Thrip back on the scene and showing an unhealthy interest in Luke's past, the vampire-fighting duo look set to be torn apart.