Sallowed Blood by Glenn Stuart

When Daniel Stone inherits Castle Fichtner in the heart of the Bavarian Alps, he believes his dreams have come true! Unfortunately, those imaginings soon turn to nightmares as he realizes something terrible lurks beneath the castle’s ancient walls. But legends are based on truth, and the truth is more dreadful than anything Daniel could have imagined! Plunged into a whirlwind of murder and terror, Daniel tries to survive the secrets of Castle Fichtner and Sallowed Blood…