The big Macguffin in Raiders of Shrieking Peak is the Inheritor's Clasp, a (potentially divinely-charged) cloak fastener that fell from Iomedae's shoulders as she attempted the Test of the Starstone. Through an over-involved backstory, a Pathfinder Society agent named Inisa Ardaali has obtained the Clasp and plans to deliver it to the Grand Lodge. But after her ship landed in Diobel, her caravan to Absalom was attacked--and now both Inisa and the Clasp are missing. The PCs are charged by Venture-Captain Valsin with travelling to Diobel and retracing Inisa's steps in the hopes of rescuing her (and recovering the Clasp). There's a very minor subplot of the Pathfinder Society trying to circumvent the Church of Iomedae when it comes to the Clasp, which is kind of fun (and surely makes things more interesting if there's a worshipper of Iomedae in the group).
The first part of the scenario takes places in Diobel, a fishing and smuggling town. GMs may find that the inclusion of Diobel in Towns of the Inner Sea is useful here. Essentially, the PCs need to make some knowledge or gather information checks to discover clues about what overland route Inisa may have left on and what dangers she may have encountered on the way. As part of the Playtest Rules, the scenario stylizes this as "exploration mode", but it's easy enough to replicate in PF1. (I do like the inclusion of false/incorrect information if the PCs critically fail a check) The PCs will likely discover a Pathfinder safe house in Diobel that was used by Inisa, and to which some members of her caravan returned to after it was attacked--they explain it was ambushed by minotaurs. The scenario does a good job of incorporating logical plot developments to keep the adventure moving even if the PCs aren't very good with the information gathering (while not making it meaningless at the same time).
The first combat encounter begins as the PCs follow the caravan's trail and find where the ambush occurred. A pair of minotaurs are still here--but Inisa and the Clasp are nowhere to be found. The PCs need to find the minotaurs' camp, which they can do through interrogation/persuasion or by following some tracks.
The minotaurs play an important part of the scenario's story. They're a tribe called the Gorebreathers, and they've been locked in a war with the forces of a powerful harpy named Ryolle who has taken up residence near the summit of Shrieking Peak. When the PCs find the Gorebreathers' camp, there's a fair opportunity to negotiate with the tribe (perhaps after a fun test of strength), though combat is also definitely an option on the table. Both possibilities are treated as equally plausible in the scenario, which is good adventure design. At the camp, the PCs will also find Inisa (either hiding nearby, or as a prisoner, depending on how long it took the PCs to arrive). Inisa says the Clasp was taken when the harpy's forces attacked the Gorebreathers and made off with most of the plunder they themselves had taken from the caravan.
On the road to the harpy's lair, there's a potential encounter against several ghasts and ghouls. This is written as an optional encounter (depending on how much time is left), and I decided to skip it when I ran it. Frankly, Raiders of Shrieking Peak can be pretty deadly with some poor rolls--not only do minotaur greataxes pack a real punch (especially on a crit), but ghoul/ghast paralysis and harpy mental subjugation can make for a fatal experience!
The final encounter against the harpy and her mentally-enslaved allies is fairly interesting. Ryolle's cave is protected by three 25'-tall watchtower platforms, so the PCs can't just run up and attack. Instead, they either have to trade missile fire or try to climb up to the watchtowers while under fire. From a tactical perspective, I have no idea why Ryolle had three watchtowers built in such close proximity to one another, especially without clearing the nearby treeline to provide better visibility. In any event, assuming the PCs triumph, they'll find the Inheritor's Clasp inside the cave and can return safely with Inisa to the Grand Lodge.
There's a good mix of combat, wilderness travel, role-playing, and skill usage throughout the scenario. I found it pretty easy to adjust for PF1 on the fly. I'm not sure if the potentially overwhelming combats are just because I adjusted it for PF1, or that difficulty level would also exist if done under the Playtest rules. As an aside, I'm not a fan of the artwork in the scenario--it takes the game into a more cartoony direction. Overall, I'm sure that Raiders of Shrieking Peak accomplished its original goal: providing an avenue to see how the Playtest rules worked in a PFS-type of adventure. I can't really blame it for not being more than that.
