From the publisher's website:
In the conclusion of the Devil We Know campaign arc, you are called once more to Cassomir, where a mass abduction of the residents of Swift Prison has the entire town in a panic. Venture-Captain Hestia Themis once more partners you with an Aspis agent to see what link the Swift Prison event has to the earlier kidnapping of a Pathfinder agent. You will explore an empty prison, delve the tunnels below, and come face-to-face with the source of Cassomir's troubles in a vile grotto deep beneath the city.
Rules of the Swift is the fourth and final installment of the Devil We Know campaign arc.
A Pathfinder Society Scenario designed for 1st to 7th level characters (Tiers: 1-2, 3-4, and 6-7).
This scenario is designed for play in Pathfinder Society Organized Play, but can easily be adapted for use with any world. This scenario is compliant with the Open Game License (OGL) and is suitable for use with the Pathfinder Roleplaying Game.