‘You are freed from all cares brothers and sisters! All worries! All need to toil and labour for the baron’s taxes, in the guild’s fields and for the peddler’s wares! All the drink you could ever need!’
Final words of an extremely drunk hedge conjurer by name of Oates Greenlock.
"A demonic plant? Don't be daft, go research something useful to society."
"But-but the p-plant! It's evil! It must be destroyed!"
"Now the flowers bloom all year round thanks to the most holy Spirit of Urban flora. It just takes a little blood."
A vicious murder happens in a town that the party happens to pop in at. Under heavy suspicion as they are strangers, the party is forced to discover the perpetrator or have their reputations blackened, especially as more and more murders occur in the town, and mysteriously stop and restart when the party leaves to go kill off that evil necromancer who kidnapped the princess.
The only problem is that a demon, possessing one of the party, is the perpetrator. And the demon makes no signs that its living in the PC's head.
In fact, for all the party knows (except for the possessed person's), their companion is an evil murderer.
Do they try and execute their friend as he's a vicious murderer, and no evidence points to demonic posession? Or do they flee town with him, trusting him, and have their reputations destroyed?