Ezmeralda performed a Taroka reading for us; as much as I don't like to believe in pre-ordained destiny it does seem like there is some truth here...
9 of Coins
This card represents power and strength. A weapon of vengeance. A sword of sunlight.
"Look for a fortress inside a fortress, in a place hidden behind fire."
Perhaps a jail or vault in Castle Ravenloft?
Update: Looking at the model of Castle Ravenloft we identified a fireplace with a secret passage behind it.
Update: Located the Sun Sword in a hidden vault.
2 of Coins
This card represents knowledge of the ancients. To help you understand your enemy better.
"Look to a place where sickness and madness are bred. Where children once cried a treasure lies still."
Abbey of Saint Markovia... Nursery?
Update: Found the Tome of Strahd in the nursery.
7 of Glyphs
The card represents a powerful force of good and protection. A holy symbol of great strength.
"Lies in a pile of treasure beyond a set of amber doors."
Presumably somewhere in the Amber Temple?
Update: The Holy Symbol of Ravenkind was found in an unlooted treasure chamber.
The Innocent
This card sheds light on one who will help.
"Evil's bride is the one you seek."
I think this refers to Ireena Kolyana (who Strahd views as his future bride); Malakor believes it refers to Vasylka. We're going to
The Donjon
This card will lead you to your confrontation.
"He lurks in a hall of bones in the dark pits of his castle."
Somewhere in Castle Ravenloft - burial chamber?
Update: The model of Castle Ravenloft indicates that there are catacombs beneath the castle.