The Dungeon of Graves is the site of my All Fighters No Breaks challenge campaign with my regular group. Rappan Athuk, more than any adventure path I can think of, is worth its price point. The challenging hallways, the ruthless encounters, the individual monster personalities, and unique traps make Rappan Athuk completely unforgettable (even if Rappan Athuk is completely unforgivable). I would not recommend this campaign for an inexperienced or even slightly experienced group. This is for your pros, and it delivers for them. At any level for your players there are five challenging dungeons in this book that would fit well for them. There are some strange racially insensitive references at a couple minor points in the book but, these can be easily changed (since these are only for the Game Master) and attributed to the humor of the time frombwhen it was written. Want to kill your players and have them realize it was their fault? Run Rappan Athuk!