This classic murder mystery begins in a hospital and ends in a passionate embrace. What happens in between will intrigue and entertain lovers of the genre. Natalie Sumner Lincoln was a prolific author. This 1924 work is one of 22 novels she published over a period of just 15 years. She was born and lived her whole life in Washington, D.C. Like her other books, The Thirteenth Letter is set in and around the U.S. capital.