At the Heart of Evil is a free Adventure Module put out by Headless Hydra Games. I used it for a game not long ago and whipped up some maps to go with the module.
This first map is the outside version. The background layer is transparent because I used RP Maptool to run the game and just slapped my keep down over a grid provided by the software. It would be easy to add a background if desired. Unfortunately, these are not as complete as I would like because of the way I used them in tandum with maptool. My future maps are much better able to stand on their own without maptool, but someone may find these helpful. Also, the map for the second level was lost somehow, so it is missing.
This is the ground level:
This is the basement Level