The Slayer of Souls by Robert W. Chambers

Only when the Nan-yang Maru sailed from Yuen-San did her terrible sense of foreboding begin to subside.
For four years, waking or sleeping, the awful subconsciousness of supreme evil had never left her.
But now, as the Korean shore, receding into darkness, grew dimmer and dimmer, fear subsided and grew vague as the half-forgotten memory of horror in a dream.
She stood near the steamer’s stern apart from other passengers, a slender, lonely figure in her silver-fox furs, her ulster and smart little hat, watching the lights of Yuen-San grow paler and smaller along the horizon until they looked like a level row of stars.