You'll interrogate Dee here. There are two Fable books to unlock here. Beating up Dee and having Crane try and stop you will unlock Ichabod's Fable book. Being nice to Dee will trigger Bluebeard to start attacking Dee. Restraining Bluebeard will unlock his Fable Book. Just remember which one you unlock and do the opposite for your replay of this chapter. Once you are done interrogating Dee the achievement will unlock.