The dark elf former thief, slut, whore and all around beggar trash Thana and her beloved new Mistress, the Vampire Princess Serana, exile of Harkon's Court and hunted by his minions for the Elder Scroll she carries have fled to the abandoned fortress east of Riften, supposed home of a reborn Dawnguard, a force made up of surviving Vigilants of Stendarr, vampire hunters and other mercenaries.

Hopefully they won't be shot on sight.

How Thana found Serana or journey out Serana and Thana start working for the Dawnguard