Trail of Cthulhu: Masks of Nyarlathotep – New York – episode 4

The Boston side quest continues! After learning about a meeting between two cultists, the investigators realize they have a chance to kill an old foe. In order to stop him, they'll have to case his hideout, figure out a plan of attack, and execute it without incident. Of course, no plan survives initial contact with reality. What tricks does their foe have up his sleeve? Hint: sometimes you don't see the forest for the giant monster pretending to be a tree.