Extermination (Vampire Plagues) by Sebastian Rook (2006-05-03)

A hundred snarling lampirs had gathered across the pathway. Grey river-mist around their feet. Somewhere a wolf howled, and a bat dive to flit low across the surface of the water. And Jack saw, with a sickening certainty, that there was no way past the lampirs... They were trapped. Ben Jack and Emily are journeying into the Polish mountains, desperate to end the lampir plague that is draining the country. If they destroy the monstrous Count Lampirska, evil found of the lampir clan, then Poland's dead can rest at last. But the lampirs will do anything to stop them...