I'm not sure specifically which 'the staircase back story' you are referring to. It could be about a particular staircase in a building with a historical or personal story behind it. Maybe it's related to a famous house where the staircase has some unique design features and a story about its construction or the people who used it.
One possible element could be the builder. Maybe it was a local craftsman who was known for his fine work on staircases, and this particular one was his masterpiece.
Well, it's said to be inspired by real events, but it's likely that some details were changed or embellished to make it more compelling for the audience.
The Staircase is inspired by the complex and controversial events surrounding Michael Peterson's case. It delves into the legal proceedings and the various perspectives involved.