Recap of recent events:
After Fleck's disappearance, the group was ambushed by two cloaked figures with poisoned crossbows. They lured Drack and Fahlias into a crowded alley, where a splash of alchemist's fire ignited a bunch of crates filled with ... something. In the resulting blast and smoke, the attackers got away, though not before one sustained major wounds. Zerash put the fire out before it could spread, but not before attracting a whole lot of attention. The sergeant of the responding guards believed their story, and offered them a place to stay for the night, because Fahlias was pretty badly poisoned.
The next day, Zerash tried scrying on their attacker. Not a lot was gained (beyond the above), but a stakeout of the east gate proved a bit fruitful. A fox headed out of the city, followed shortly by a dwarf. Zerash headed out to follow them and caught the dwarf, losing track of the fox. Turning on the charm, he scared the wits out of the dwarf (with Drack's help) but didn't get much besides the name of who sent him: Big Fritz, some big boss in the southeast part of the city. The dwarf fled, and Drack tried to follow but gave it up when it was obvious his quarry was onto him.
Zerash sat to wait for the fox to return, who eventually did. He was being skittish, though, and eventually Fahlias came out to talk to him. Something didn't seem quite right, and Zerash did a True Seeing to check. Turned out the fox was a transformed human, and the disguise being up, turned to flee. He was temporarily halted by a Command from the priest, and was grappled before he broke his mind free. Turning into a horse got Zerash off of him, but he was halted again by a blade barrier, and saw reason when called on to surrender. He returned to his human form, but was entirely mute, not talking at all and refusing to give nonverbal answers to direct questions. Zerash's only remaining idea was to take him to the temple of Os to have the spell lifted...