Skyrim:The Restless

Quick Walkthrough
#Read The Restless at The Winking Skeever.
#Gain access to the cell in Castle Dour Dungeon by whatever means necessary and read ''Kevon's Note''. Take the map.
#Travel to Orphan's Tear and find the boat to Blackbone Isle.
#Enter Blackbone Isle Grotto and take Cyrus' Boots, Cyrus' Clothes, and Cyrus' Sabre.
#Fight your way back out to the boat.

Detailed Walkthrough
A Pirate's Life
Upon installing the Dead Man's Dread Creation, you will automatically receive this quest pointing you to The Winking Skeever in Solitude. On one of the tables inside, you will find a book titled The Restless which describes the later life of Cyrus, the protagonist of The Elder Scrolls Adventures: Redguard. It mentions Blackbone Isle, a long-lost island in the Sea of Ghosts said to house an ancient treasure. The last person to visit the island reportedly died in the nearby Castle Dour dungeons.

Head to the dungeons in order to figure out how to gain access to the cell containing the pirate's corpse. You can speak to a Solitude Guard seated outside the cell and pass an easy Persuasion skill check to convince him to open the cell for you. A starting level character of any race can pass this speech check by activating the Shrine of Dibella in the Temple of the Divines just outside. Alternatively, you can commit a crime yourself and get thrown in jail, although there are obviously some disadvantages to using this method. Once inside, you will find the skeletal corpse of Kevon next to a note you need to read. It will reveal that a map to Blackbone Isle can be found beneath a loose brick within the cell wall. Grab it and head for the coast.

Old Pirate Den
Your next destination after escaping Castle Dour is a coastal shipwreck known as Orphan's Tear. Although this location is usually inhabited by bandits, on this occasion you will encounter a gang of Blackwater Brigands led by Celeste. This encounter will actually add an unnamed miscellaenous objective to your journal directing you to kill Celeste and claim her unique sword, the Blackwater Blade. This is secondary to the current quest, but you will likely end up killing Celeste in any case as the brigands are hostile and are guarding the only boat to Blackbone Isle.

Once the threat has been neutralized, activate the small boat to sail to Blackbone Isle. The entirety of the small island consists of a shoreline crawling with undead; indeed, you will likely be attacked the minute you arrive. You may explore the island's exterior if you wish, but the quest will direct you to the entrance of Blackbone Isle Grotto located right next to the boat. The grotto is similarly filled with undead, and houses a well preserved ship named ''Dead Man's Dread''. Fight your way through the ship's undead inhabitants until you reach the captain's quarters on the lower level. Here you will find the ''Captain's Journal'' explaining the fate of the ship, as well as Cyrus' Sabre hanging above the desk. Take the sabre, and loot the chest next to the captain's bed to obtain Cyrus' Clothes and Cyrus' Boots. All three of these relics of Cyrus need to be taken to progress the quest.

Attempting to leave the ship with your new items, you will quickly discover that angry Ghost Sailors have arisen to defend their final resting place. Fight your way back to the entrance and face the Ghost Captain out on the deck of the ship. With all the spirits defeated, you can safely make your way back to the boat and leave Blackbone Isle.

A New Player Home
Although the quest formally concludes after making your escape, you will soon receive a mysterious note from a "restless soul" via courier, advising you to convert ''Dead Man's Dread'' into a player home. Return to the ship via the boat at Orphan's Tear to complete this objective and claim the island as your own. The ship contains several crafting stations and storage containers, as well as multiple copies of the unique clothing items added by the Creation.

Notes
You will only encounter undead in the exterior areas of Blackbone Isle if you have either the Bone Wolf or Plague of the Dead Creations installed. If you have neither Creation installed, the island will instead be inhabited by six harmless rabbits.
The Ghost Captain and the other spirits will not follow you below deck. This can be exploited by running back inside the ship to heal.

Bugs
 

Quest Stages