This is the way to Panama. For anyone who hasn't seen the film, the Panama canal was in the cellar and the crazy brother Teddy who thought he was Teddy Roosevelt, would go and dig the Panama canal and then the dotty old sisters would bury their victims' bodies in the holes he dug.
I decided to make my "way to Panama" via a secret passage. I'm surprised how well this works. I made the bookcases and glued a half inch square peice of wood up the middle of the back of the moving one. I then inserted pin hinges - well bits of sturdy wire in the ends of the wood, the floor and the ceiling et voilá a swivelling bookcase. It needed a bit of sanding in various places (all hidden by trims etc) to make it swivel smoothly but it works a treat now and opens just enough to allow you to see the cellar walls and the beginnings of the handrail indicating that there are steps which descend.