Natalie Sumner Lincoln's 'The Thirteenth Letter' is a gripping mystery novel set in the early 20th century. The story follows a young woman who becomes entangled in a web of deceit and secrets when she discovers a mysterious letter hidden in her deceased father's belongings. Lincoln's writing is characterized by its intricate plot twists, vivid descriptions, and attention to detail, making it a riveting read for fans of suspense and detective fiction. The novel is also notable for its exploration of gender roles and societal expectations during the time period, adding an additional layer of depth to the narrative. Overall, 'The Thirteenth Letter' is a compelling blend of mystery and social commentary that will keep readers eagerly turning the pages.