To START the quest, speak to Father Aereck, located in the church of Lumbridge. He will tell you that a ghost has been haunting the graveyard south of the church and that he needs help in laying it to rest.
He requests that you speak to Father Urhney, who is located in the swamps, south of Lumbridge Castle, and is an expert ghost hunter himself.
Exit the graveyard through the southern exit and head through the swamps south of the Lumbridge Castle. Follow the shoreline to a mining area, then head west towards a small hut.
When you arrive you will find Father Urhney meditating inside his hut. At first, he will be uncooperative and unwilling to part with his services, but he will eventually hand you a Ghostspeak Amulet. (The amulet allows players to communicate with ghosts, a feat otherwise impossible).
Leave the swampy area and head back towards the graveyard in Lumbridge.
Open the coffin located within a small house in the graveyard. Equip the Ghostspeak Amulet and speak with the restless ghost. He will reveal that he isn't certain why he hasn't departed, but he thinks it might have to do with his missing skull. He tells you that he was attacked by a warlock while he was mining to the south, and that is where his head probably lays. He requests you to retrieve it for him.
The ghost's skull is located in the mining area south of the graveyard. Search the rocks a bit to the east of the mining area, and the skull will appear inside your inventory. However, when doing so, a skeleton or skeleton warlock will appear and attack you. Either kill the skeleton or run away and return to the cemetery where the ghost resides.
Use the muddy skull on the open coffin, and a cutscene will ensue, where the ghost will thank you and then fly off into the River Lumbridge.
Congratulations! Quest Complete!
Guide Made by: _unidentified
Corrections submitted by: Rebecca, Majinvegito3