NO SPOILERS
SPOILERS!
The backstory to Severing Ties involves the Aspis Consortium trying to improve its relationship with the Cult of Lissala after some drama involving the Hao Jin Tapestry in previous scenarios. What the Consortium, led in Riddleport by a silver agent named Vidrin Jenk, wants to do is gift the cultists with three items sacred to other faiths in the city (presumably, so it can sacrifice or desecrate them in some way). As each of these faiths owe the Aspis Consortium a financial debt, it should be a simple matter of having someone pick up the sacred items as payment and deliver them to the cult's secret safehouse. But what those Aspis snakes don't know is that the Pathfinder Society is on to their plan, and intends to throw a wrench in the works! Venture-Captain Sheila Heidmarch explains to the PCs (in a quick flashback briefing in Magnimar) that she's arranged for a group of Aspis specialists to be intercepted en route to Riddleport so that the PCs can impersonate them. Once they've collected the three gifts and learn the location of the hidden cult safehouse, they're to sabotage it to discredit the Consortium in Lissalan eyes and break the alliance. It's a creative premise for a scenario.
Despite the premise, those rare PCs who invest a lot of ranks or abilities in skills like Disguise and Bluff will probably be disappointed to learn that the scenario handwaves any checks. Vidrin Jenk and the other Aspis thugs at their headquarters in Riddleport (Barracuda Cartage) automatically believe the PCs are out-of-town agents once they see the brass coins that Heidmarch has provided. The Consortium really needs to invest in photo ID membership cards!
The PCs can visit each of the three temples to collect the gifts in any order. One is Publican House, the city's temple to Cayden Cailean, which is of course a raucous tavern. The sacred mug the PCs need to obtain has been inadvertently entered as a prize into a drinking challenge, and this presents a fun opportunity for a light-hearted contest of strength, dexterity, and intestinal fortitude. Another temple is the House of the Silken Veil, a brothel dedicated to Calistria. Here, the PCs need to negotiate with the temple high priestess/madame, Shorafa Pamodae. It's very possible they get tricked into accepting a fake sacred relic (a dagger in a locked case that has magic aura cast on it), but the way the scenario plays out, getting fooled probably won't matter in the end. A third temple is the Fish Bowl, the city's temple to Besmara; here, to obtain a sacred bicorne hat, the PCs will have to fight some sea creatures feasting on some human sacrifices! For Riddleport aficionados, the scenario doesn't do much to give the city a distinct feel (as a pirate haven/gang town), but it's still nice to have these temples and NPCs fleshed out.
Assuming the PCs can get at least two out of the three sacred objects, Jenk then provides them with the location of the Lissalan safehouse to deliver the gifts; the safehouse is hidden under an abandoned tattoo parlor. Here's where it's vitally important that the PCs remember their mission: sabotage the safehouse, don't get into traditional dungeon crawl and try to fight their way through! The threats in the underground complex are very real: basilisks that can easily turn someone to stone, a couple of dozen cultists, an animated stone guardian statue, etc. PCs can succeed in the sabotage by doing things like setting the basilisks free, causing a gas leak, flooding it, and more, but the scenario instructs GMs to allow creative options the PCs come up with. Once the sabotage has been performed and a clue left to implicate the Aspis Consortium, the PCs can escape and consider it a job well done. The overall lesson of this part of the scenario is: fights probably mean failure, so be smart!
All in all, I like the general story and approach taken in Severing Ties; it's certainly different than a run of the mill scenario. It also helps flesh out a key location in Varisia. I'd recommend it, but probably only for more experienced players who will pay close attention to the exact instructions given to them in the briefing.