A Hamelin researcher has lost all faith in his assistants, and is unable to continue his research.
This errand is available to complete after defeating Candelabracadabra on The Tombstone Trail.
Talk to the man on the balcony southeast of main street (northern part of Hamelin) and it becomes apparent that he has lost most of his belief. Once again the solution is nearby. Head up the eastern stairs to find a man with a mustache full of belief. Exchange it to complete the errand.