Natalie Sumner Lincoln (1881โ1935) was an American author renowned for her mystery novels and contributions to the genre during the early 20th century. Born in Washington D.C., Lincoln found her literary voice amidst the backdrop of a burgeoning American detective fiction movement, which contemporarily included the works of writers such as Mary Roberts Rinehart. Lincoln's storytelling often reflected her astute observations of society and politics, visible in her hometown's corridors of power, which she adeptly translated into gripping narratives. Her novel 'I Spy' stands as a testament to her literary skill, weaving intricate plots with a subtle undercurrent of espionage reflective of the period's zeitgeist, marked by the Great War and the interwar years. Lincoln's narrative style, characterized by strong characterization and a keen sense for suspense, placed her among the noteworthy female mystery writers of her time. Although less well-known today, her works once attracted a loyal readership, longing for the escapism her carefully crafted detective stories provided. In 'I Spy,' Lincoln showcases her customary wit and narrative poise, alongside a deep understanding of human psychology, which remains a hallmark of her literary repertoire. Lincoln's contribution to the field of detective fiction remains significant, as she helped to shape and expand the boundaries of the genre for future generations of readers and writers alike.