Seven Keys to Baldpate by Earl Derr Biggers

Dime-store novelist William Magee has gone to Baldpate Inn to do a little soul-searching in an attempt to write a serious work. Thinking he will be alone and uninterrupted, Magee arrives at the inn in the dead of winter. But he discovers that there are six other keys to Baldpate Inn, and the holders of those keys enliven his stay with bribery, shootings and plenty of mystery.