Bloody Jenny's Gambit

From publisher blurb: A 5th Edition Mini-Dungeon for four to six characters of level 4 A remote temple. A mysterious oracle. Travelers and pilgrims return changed, but is this from their glimpse of the future or due to some darker plot? Thus the stage is set for adventure. The party discovers all the perpetrators of a rash of crimes tied to a cult called the Red Blades recently journeyed to a remote temple to consult the reclusive oracle Morjiana Tythia. Unbeknownst to the adventurers, or even the oracle, the temple fell months ago to Bloody Jenny Baba, a night hag, and her cabal of doppelgangers. Using a magical crystal to observe the oracle’s visitors, the doppelgangers assume their forms and murder these unfortunate victims. The adventure begins when the characters approach the isolated temple.