
To try not to spoil anything I'll be brief. 3 people have killed someone close to them and all report smelling sage and then seeing a shadow monster with huge talons attack their loved ones. All of the victims have come from the same childhood horrors with it's roots in the "Satanic Panic" of the 80's. The Episode becomes very personal for one member of the BAU and it could end in disaster.
Huge kudos to M.G.G for the direction of this episode. It's not overly graphic, but is actually full of quite scary imagery. Also, as with other episodes directed by M.G.G, there is homage paid to other works of horror. In this case the surnames of guest characters are also the surnames of characters from The Exorcist. Another case is when the home town of a victim is revealed to be Derry, Maine, the town Stephen King created as the backdrop for IT.
This episode was really creative and actually made me a little jumpy. I highly recommend watching this. Congratulations, you may have made a grown woman terrified of the dark.