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.

Click image for larger version. 

Name:	Heart of darkness Keep Outside.png 
Views:	259 
Size:	871.6 KB 
ID:	48847

This is the ground level:
Click image for larger version. 

Name:	Heat of darkness_Keep_1.png 
Views:	161 
Size:	498.8 KB 
ID:	48848

This is the basement Level
Click image for larger version. 

Name:	Heat of darkness_cellar.png 
Views:	281 
Size:	491.6 KB 
ID:	48849