A Sour Sixteen (sweeney/POTC crossover fanfic) 

On the night of her sixteenth birthday, Joan who is an emo girl from the 21st century is sent back to the 18th century because of a deal her real father made long ago. Now she has to adjust to her new life and face the past head on.
Keywords: crossover, sweeney todd, fanfiction, fanfic, jack sparrow, potc