From the publisher's website:
The mastermind behind the Shadow Lodge incursion on the Pathfinder Society has been revealed—a mysterious figure known only as The Spider. Your journey to discover the traitor’s whereabouts and identities will take you throughout the streets and underground of Almas, even to the floor of the People’s Council itself.
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.