Seven Keys to Baldpate

And then there were …seven!

A well-known pulp fiction writer, and socialite from New York, wants to get away from it all and be alone to write a serious novel. He chooses to go to Baldpate, an inn closed for the season and perfect he thinks for the isolation he wants. His desire for solitude at the empty Baldpate Inn however is thwarted as visitor after visitor comes in with one of the titular keys to the Inn. Why are they here?