Seven Keys to Baldpate is a 1913 novel by Earl Derr Biggers. A bestseller, it was adapted by George M. Cohan into a play, which in turn was adapted several times for film, radio and TV. 1] 2] 3]The plot of the novel differs from the play in many respects. 4]The setting was based on the real Baldpate Mountain. 5] An American hotel inspired by that name, The Baldpate Inn, opened in 1918.