Buyers and Cellars/Quick guide

Getting Started

 * Talk to Darren Lightfinger in the cellar North of the house with a Furnace in Lumbridge.
 * Pickpocket the dummy.
 * Talk to Darren.

The Chalice

 * Talk to Robin who is south of the castle but inside the walls.
 * Go to Father Urhney's house in Lumbridge Swamp.
 * Ask him about the chalice.
 * Light a fire outside one of Urhney's windows.
 * Talk to Urhney and mention the chalice then the fire.
 * Pickpocket Urhney quickly to get a Complex key.
 * Use the key on the chalice display case.

Finishing Up

 * Return to Darren's cellar.
 * Use the chalice on Darren.
 * Quest complete!