From publisher blurb:
A Pathfinder Society Scenario designed for levels 5-9.
Recent events have left the Master of Spells Aram Zey unable to fulfill his duties, and without his expertise, the Pathfinder Society struggles to resolve pressing arcane matters. The Decemvirate has reopened the decade-old case of the most qualified replacement: Aram Zey's predecessor and former Master of Spells Sorrina Westyr, who disappeared while handling a powerful wayfinder that the Society has since kept closely guarded. It is up to the PCs to track down Sorrina Westyr—and bring back whatever remains.
Content in "Captive in Crystal" also contributes directly to the ongoing storyline of the Grand Lodge faction.