As mentioned, this is a really good introductory adventure. It sets the mood nicely for a Dresden Files campaign, and shows the players what's in store for them: a mix of the supernatural and the mundane, and plenty of bloodshed. Plus, it's free! You can't go wrong with this- or the Dresden Files rpg in general, though I prefer the new streamlined Fate Core system. Supposedly they're releasing an updated Dresden Files game with the new Core rules, and I can't wait for that!