The Fourth Bear by Jasper Fforde

The Gingerbreadman the most dangerous, and possibly most delicious, mass murderer in the history of Reading has escaped custody and is now at large and ready to resume his rampage. The only officer to have captured him before, detective Jack Spratt of the Nursery Crime Division, has been suspended from active duty until he can prove he’s not a looney.

Instead Jack and his partner Sergeant Mary Mary turn their attention to the disappearance of journalist Henrietta “Goldilocks” Hatchett, last seen in the home of three bears living out in the middle of Anderson’s Wood.