Jewels of the Carnifex is a level 3 adventure for 6-10 characters or fewer 4th to 5th level characters. Judges who have been following the Dungeon Crawl Classic adventures should know that the mysterious monsters and other obstacles can easily be modified upwards to make sessions more challenging. Spoilers ahead.
Much like the previous adventures, Jewels combines strong theme, mystery, logical consistency ("method to one's madness"), an occasional backdoor solution (secret door), fighting, and traps players have to defeat, not skill rolls. The plot of Jewels is the Lawful Azazel and his followers have destroyed the Cult of Carnifex has been destroyed and sealed away its patron deity. Azazel, however, has called for the primal light for aid. This light infuses him, and, ironically, has corrupted the undertemple far more than Carnifex could ever do. The PCs enter the undertemple to investigate, and either aid Azazel to finally destroy Carnifex, or free her from her prison.
DCC adventures implement well the "method to one's madness". Azazel and followers have settled into the undertemple (and are corrupting everything), so the enemies are either his followers, or corrupted overgrown versions of underground vermin. Likewise, many rooms reflect either the atrocities of Azazel, or the original temple of Carnifex.
Probably the only nitpick I have is that there's not much of a conflict in choosing Carnifex over Azazel. Azazel's a fanatic whose first impression towards to the PCs is to kill them. Carnifex is babe of a goddess who gives stat bonuses. No contest, really.
Otherwise, another fine job by Dungeon Crawl Classics!
[5 of 5 Stars!]