A penniless writer who falls in love with a courtesan must defeat his jealousy and an evil Duke in order to rescue his lover from her underworld.

It would have been nice if we got a time and location of the story. The movie is set in the city of Paris in about 1899, unfortunatly above could be from the middle ages to the Joss Whedon's 'fire fly' lile future.
But you did get the basic story nailed down though which is good.

I'm not a fan of the movie but this is a good logline! It covers all the essential story elements and promises me a better movie than I remember seeing.