Prison of Gallus

Publisher's blurb:

Here's a grim little situation. You've got a lord who pissed someone off. Someone who cursed his pregnant wife. When their child was born it was a flash eater. A living ghoul. To this disgraceful fact the lord hid away his son, saying it died. But as Gallus grew so did his appetite and his aggressiveness.

Now the lord has imprisoned his son, still hoping to find a solution for the curse. But while he keeps his son alive, he must also feed him and the lord has taken to kidnapping victims.