As they finished looting Xanesha's body, 2 figures in black plate marched up and asked what was happening. The druid stayed in her wild shape so that she wouldn't be recognized, The barbarian largely kept quiet and the bard did most of talking, explaining that they were investigating some murders in Sandpoint and had found clues pointing to a creature living in the tower. Six more hellknights arrrived on horseback and the officer took over. He ordered three to investigate the tower. When one came flying back out of the door he asked the party to take over.
The fought the scarecrow. The barbarian was reduced to negative hit points at one stage, but eventuall with a lot of help from the druid and a little from the bard they got him to the stage where he would run, almost killed hi with AoOs and then finished him off. That was a challenging fight, though it was unfortunate that the bard was ineffective again.
The druid carried them up to the top of the tower, then resumed her normal for to be able to use her wand of lesser vigor. They came down the stairs Observing the trapped bell on the way. Meanwhile the shapeshifters had adopted human form and came out the bottom of the tower claiming to have been charmed by Xanesha. They were arrested, but later escaped.
The party were asked what they found and admitted to some papers which they reluctantly handed over. One glance and the officer said they had to go see the mayor. ordering some of his men to lend the party their horses.
They mayor fainted when he saw that he was to have been murdered. He asked the party about it. They gave a little more information, admitting to a fight in the sawmil with masked cultists during which a fire had started "accidentally". They said they though the creature from the tower had probably been in league with officials of the city and that they needed to investigate further. The mayor ordered the officer to give them full assistance.
The officer tried asking more questions, but they avoided giving full answers. Eventually the bard and barbarian went to rest as they had been wounded, whilst the bard and officer went to the temple of Desna where the party had earlier left the journal they found in the sawmill.
I decided that the code had been broken and the expert there was able to give them a lot of information. Information that proved Ironbriar's guilt, that he was doing it for Xanesha, who had been sent to the city by her master to gather greedy souls. They went back to the mayor with that and he gave the bard her share of the reward.
The other two turned up the following morning, expecting there to be trouble, but they were just given the reward, and the mayor told them he had ordered a civic banquet in their honor.