Played at tier 10-11 with 4PCs. Took about 5h, but could run longer.

Refreshing plot with a story that makes sense and is accessible to the players, for once. Fights are tough but the players have no excuse to not come fully prepared.
Barring issues below, a recommended scenario which does create some roleplaying, good fights, and serious decision points.

GM comments below.

I want to place this in Alaska... Palin's Cove.

This is a good scenario. I hope it surprises players.
There is enough in here for every play style. It can be challenging.
The story is good, setting great. The role play will allow allot of give and take with the party and GM. Well thought out combat. I would recommend this for non PFS play.

Story 5/5
Setting 5/5
Role-play-ability 5/5
Combat 5/5
Suitability 5/5

Ran this for a group of regular PFS players, and I can offer some food for thought, characterized by positives (+) and some potential negatives (-) with every attempt to avoid spoilers.
The scenario is very modular(+) which is often a rarity in organized play. The PCs involvement in the scenario is largely up to them - they'll be presented with numerous leads and avenues to explore. The party I ran actually wound up bypassing quite a bit of the first few acts with some lucky rolls and good guesses. Even with this 'shortcut', the scenario still ran for nearly five hours(-), so GMs must be very aware of time management.
The scenario offers a good challenge(+) without feeling overwhelming, has a very cinematic and horror-influenced feel(+), has signficant ties to the season's metaplot(+) that are cool, and presents an array of great opportunities to roleplay(+) their characters through meaningful decision points. However, many of these decision points may not have the salience that the author indends(-) due to the alignment restrictions that exist within PFS.
Overall, this scenario is similar in tone to the Carrion Hill module, and fans of horror, mystery and intrigue who game with fairly experienced players should fare well.

There are a lot of good points to this scenario. Challenging combat (as you expect from Season 4). The Scenario does a good job of advancing the plot of Season 4 as well, and overall provides a great feel.

I'm not sure if some of my problems come from the way the GM ran it, or the way it was written, but it seems like if you do not have good diplomacy in your party, you will never be very successful at this module. We had some decent people, but our rolls were terrible. We spent way too long in the town trying to figure out how to contact the cult. We are supposed to be infiltrating a cult, so you should not be going around asking "Hey, do you know where i can find this cult?"

I also wondered about the ritual that happens. It seemed to us that it was not optional to go through that, so most of us did so until the end of the party's turn came up.

There also seemed to be some confusing about using Coup de Grace in the scenario. The GM tried to do so to a person with a bag over the head, but you cannot execute a coup against someone who is not at least being held down (pinned after grapple) or held. That needs to be looked into as well.

Overall we had fun, but this ran HOURS longer than it should have, mostly due to the time spent in town.

My Experience

I ran this module for a table of five players at tier 7-8. The characters were a spellcasting cleric, two gunslingers, and two fighters, all in-tier. I am still learning to deal with high-level characters' abilities and don't have a lot of experience at that level yet.

The Good

There's a lot of roleplaying potential here. Like Midnight Mirror, which I allude to in the title of the review, the players can spend a lot of time just wandering around the town and interacting with people. A prepared GM can make this really, really engaging and fun. If you're prepared to go with the flow and let your players loose, then the first part of the scenario can be great.

The combats were challenging and difficult for the players. The ambiance through the second act - before the combats really break out - can be remarkably creepy. Like, Indiana Jones and the Temple of Doom's Cult of Kali creepy. If a GM has the time to make this come to life, it's an awesome experience.

The Bad

Time. If you're limited to a 4-hour slot, it's hard to do this scenario justice. I've read of situations where this scenario has gone to 7 or 8 hours and that doesn't surprise me. If a GM has to be prepared to run this properly, they also have to be prepared to hustle the players along.

The "Unique Treasure Item." I feel like there's supposed to be a huge moral quandary, and the choice to accept or not accept is supposed to be a real question. It wasn't, which was something of a disappointment. Perhaps a statement about the players themselves, but there's nothing in the scenario to suggest to them that they can still succeed without accepting it, so they didn't feel that there was a choice involved at all. It's a neat item, don't get me wrong, but it sort of seemed like a letdown at the table.

Conclusions

For GMs: Strike a balance between sandbox and guiding the players, and be prepared to improvise. Bring handouts of the town map and headshots (character cards work well) to help the players keep track of who's who.

For Players: don't be impatient for combat - you'll get there soon enough. Bring your most balanced socialite - Diplomacy, Bluff, and Knowledge (Local) are easily as important as that +14 to hit with your weapon of choice.

Overall Feegle Rating: Great potential in the hands of the right GM with the right mix of players, with massive potential to run long.