The Restless Ghost

This quest has a quick guide found here.

It briefly summarises the steps needed to complete the quest.

Details

Start point	Speak to Father Aereck in the chapel south-east of Lumbridge Castle.
Official difficulty	Novice
Description	A ghost is haunting Lumbridge graveyard. The priest of the Lumbridge church of Saradomin wants you to find out how to get rid of it.
Length	Short
Requirements	Capable of killing or running away from a combat level 13 skeleton.
Items required	None Three Lumbridge teleports (recommended) Any means to the Wizards' Tower (recommended) (members-only): An Amulet of glory to teleport to Draynor Village. Necklace of passage to teleport to Wizards' Tower bridge
Enemies to defeat	None

Walkthrough

Getting started

Talk to Father Aereck located in the Lumbridge chapel just east of Bob's Brilliant Axes, and he will tell you that a ghost is haunting the graveyard in Lumbridge. He needs you to help him. He wants you to talk to Father Urhney, located in a house west of Lumbridge Swamp, and get some information from him on ghosts.

Finding Father Urhney

Go south of the castle, and then keep going west in the swamps. You'll soon come upon a small house. Go inside, and talk to Father Urhney about Father Aereck needing help with the ghost haunting the graveyard. He will give you an amulet of ghostspeak so that you're able to talk to the ghost. (Note: You will need the amulet of ghostspeak for 8 later quests, so keep it in your bank after the quest. If you ever lose it, Father Urhney will give you another for free. It's advised to obtain multiple amulets via the drop trick just in case.) Now, go back to the graveyard in Lumbridge, and go to the marble coffin that is located in a small house by the graveyard.

Freeing the ghosts

Wear your amulet of ghostspeak and search the coffin. Talk to the ghost who comes out. He will tell you he is missing his skull and wants you to get it for him. He will say he was near the Wizards' Tower on an island south of Draynor Village.

The Restless Ghost - Battle — Fighting the Skeleton in the Wizards' Tower.

Head to the Wizards' Tower, and climb down the ladder in the room directly next to the entrance. Down the ladder you will find an altar. Search the altar. The ghost's skull shall be there, but when you grab it, a skeleton will appear and attack you. Kill it or run, and make sure you have the skull in your inventory. Then, go back to the graveyard.

Talk to the ghost. He'll want you to put it in his coffin. Use the skull with the coffin and he will rest in peace. You will see his spirit disappear into the river. When you have done this, you will have finished the quest.

Note: Players who complete this quest with a Prayer level of 1 will gain 8 Prayer levels, resulting in a Prayer level of 9.

Reward

1 Quest point
1,125 Prayer experience
Ghostspeak amulet (keep for Creature of Fenkenstrain)

Required for completing

Completion of The Restless Ghost is required for the following:

Trivia

The Restless Ghost is one of 6 quests released on the launch day of RuneScape.
You can understand the ghost in the ending cutscene of the quest even without a ghostspeak amulet equipped.