Ravenloft Heart of Midnight J. Robert King Ravenloft #4 1st Print TSR 1992
Revenge. The word rings in Casimir's mind. He has laid his plans for a decade - ten years among the scruffy children, the rats and the fleas of an orphanage. At last Casimir sets his intricate scheme into motion, seeking glorious revenge upon the man who slew his mother and made him an orphan.
But revenge is a merciless master. To slay his nemesis, Casimir summons a dark and powerful curse. And when that terrible curse is summoned, he must confront the greatest foe of all...himself.
Heart of Midnight is the fourth in an open-ended series of Gothic horror tales dealing with the masters and monsters of the Ravenloft dark fantasy setting.