1.01 - Northwatch Keep - The Elder Scrolls V: Skyrim wiki
Northwatch Keep is located in the far northeast corner of the map. It is a Thalmor-held fort on an otherwise deserted beach. You will come here for the quest Missing in Action to rescue Thorald Gray-Mane.
Skill Book: (One-Handed) 2920, Morning Star v1 (found in the kitchen on the shelf behind the bar)
Skill Book: (Two-Handed) The Legendary Sancre Tor (found in the large crumbling chamber in an expert-locked room)