I'm halfway through the Christopher Moore. Lovely nonsense, but catnip to those who love that city and era.
Here's the Sacré Bleu chapter guide, where Christopher Moore "[m]ostly . . . tried . . . to fill in the visuals for the paintings that [they] simply couldn’t put in the book, as well as give you a geographical and historical context where [he] could":http://guide.sacrebleu.info/