Mystery at Ravenrock (PF2)

From publisher blurb: The Final Chapter When our heroes return to Ravenreach all is not well. The castle is in lockdown and the town hasn't heard from anyone there in days. Worse, our heroes learn they are wanted for attempting to assassinate the baron. Sneaking into the castle through a secret entrance at the bottom of the hill they find a way in via a slippery sewer drain. Snaking up through the dungeons below they unearth ancient secrets, encounter deadly monsters, nasty traps and twisted abominations. As they piece together the sinister plot to frame them, the party must take care to avoid killing friends while fighting foes as they navigate through the dungeon and castle. At last they encounter the usurper and his guard of monstrous henchmen for a final boss fight! The exciting conclusion includes: Detailed treasure descriptions. Tactics for major encounters. New creatures and new troll fighting equipment. Ancient secrets. A lurking evil spirit. A horrifying experimental laboratory.