The Kingdom of Pleana was a very peaceful place until an the evil warlock Daimon came. He captured one of the king's daughters, princess Daisy, and took her to his dark castle. Princess Rose and princess Lily tried to rescue here, but never returned. The king offered a reward for whoever rescues his daughters. Two adventures embarked on the journey, but did not return either. Then... you tried to be more succesful, by entering Castle Shadow yourself, the Warlock Domain...
The style of this game can be called "olschool-puzzle-adventure". You'll have to explore a really big castle, and solve tons of puzzles along the way. They are not the type of puzzles of games like Nightmare or Xod, but more the "pick things up, and doing things which changes things elsewhere" :) style. Quite enjoyable, and really challenging, I must say.
Along the way, there's also some action, like a couple of RPG battles. The RPG battles aren't that special, they are the normal turn-based style, but they're not that bad either. The graphics are not that fantastic, they are STK, but all rather simple, kind of like the first episodes of Chrono Wars. Cool things: You can kill most people in the game, even the good guys :), and there's a couple of endings!
This game is a side-story to Htrae, Alan's "larger" project. I do hope he is ever going to finish that. A demo was released some time ago, but after that I never heard from Alan anymore... If you like some old-fashioned adventure/inventory-style puzzles, you should really give Warlock Domain a try.