The Writing on the Wall

Hadvar was in charge of the prisoner list when the Imperial Legion tried to execute Ulfric Stormcloak at Helgen. Among the prisoners was an amnesiac priest from Cyrodiil, who knew nothing other than that his name was Martin. He wasn't on Hadvar's list, and was clearly not a Stormcloak, but the Captain in charge said he should be executed anyway. Then a dragon appeared in Skyrim for the first time in centuries, and burned the town to the ground. Hadvar fled to Whiterun, to tell Jarl Balgruuf what had happened, taking Martin with him.

Now they're in Bleak Falls Barrow looking for a Dragonstone for Farengar, Balgruuf's court wizard. They encounter many undead warriors, and a strange stone wall with mysterious runes engraved upon it. One of them has the oddest magical experience, and the other has to save him from certain death.