We can't remember the precise moment it became cool for 30-year-olds to be seen reading young adult novels in public, but it might have been around the time "Harry Potter" movies were outgrossing "Star Wars" at the box office. Like the tweaking money fiend it is, Hollywood has been chasing that YA cash cow dragon for years now, occasionally hitting it big with the likes of "The Hunger Games" and "Twilight."

Unfortunately, for every "Harry Potter" there's a "Golden Compass" hemorrhaging studio gold, and for every "Twilight" there's a "Beautiful Creatures" uglifying their bottom line. This week "The Mortal Instruments: City of Bones" is rolling the dice on Cassandra Clare's sexy supernatural saga to become a franchise, so we're recounting ten cautionary tales of perfectly viable YA series that could have spawned oodles of trilogies but had to settle for one lousy movie.

'The Mortal Instruments: City of Bones' Review
categories Features, Movies