At the shore of the Misty Chanel lies the Ferry Station, the only way to enter the isle of Skara Brae after the disaster that burned down the city. The Ferryman, a undead but otherwise harmless being, will bring passengers to Skara Brae for the price of one Gold Coin per person, the travel back to the mainland is free. If the Ferry is on the other side, a horn will summon it. Talking with the Ferryman however, is only possible with the Seance-spell.
Even after the ghosts of Skara Brae found their peace, the Ferryman remains to do his duty, as he is bound to Britannia for all eternity.
A hint: Don't attack the Ferryman, it will have dire consequences.