This is a nicely illustrated (and fully furnished) little supplement of a haunted mansion (or evil cult headquarters, or what have you) based on the old House of Hell supplement from Games Workshop. Basically they deleted the original plot line (developed by Steve Jackson, of all people -- one of my favorite game designers) and "repurposed" the house to serve as a backdrop for anything you want to use it for. It is primarily useful for GM's who don't have a lot of time to draft something up for themselves, but still need a large mansion for their players to work through. This one is better illustrated than many (though I have seen better). There are additional items of furniture and scenery that can be photocopied and cut apart to create new areas and obstacles for your players, including underground elements such as a minecar railway (for those Indiana Jones moments) and tunnels. There's also a section suitable for creting lawns and gardens. Overall I give this one a "four" simply because of the artwork, which is quite evocative. Keep in mind though, you aren't getting any kind of plot line, just a background against which you can adventure. In addition to this as a source of ideas, you may also want to look at "This Old Haunted House," and "This Old Haunted House, Too," both by Chaosium for Call of Cthulhu.
[4 of 5 Stars!]