Confident they haven’t got The Host a dud on their hands, Constantin films have already begun work on a prequel to their August release “The Mortal Instruments : City of Bones”.

Good news for fans, bad news for Lily Collins, the film will be a prequel.

Stephanie Sanditz has been hired to turn the book series “The Infernal Devices” into a screenplay fit for the screen, says Heat Vision. There are three books in the “Infernal Devices” line, “Clockwork Angel”, ”Clockwork Prince”, and ”Clockwork Princess”.

Infernal Devices is set in Victorian England and sees a new teen girl plunged into a journey of adventure and self-discovery. The books feature the ancestors of many Mortal Instruments characters as well as some character overlap.

“The Mortal Instruments : City of Bones” opens August 23.