Set on the eve of World War I, the novel follows an ordinary man who becomes entangled in a dangerous plot after a mysterious stranger shows up at his apartment, claiming to be a spy. When the stranger is murdered, the protagonist is falsely accused and becomes a fugitive, fleeing to the Scottish highlands. He must unravel a conspiracy of international espionage and prevent a political assassination to clear his name.

In this classic detective novel, the story follows the intelligent and resourceful amateur sleuth, Philip Trent, as he investigates the puzzling murder of a wealthy financier. Initially deemed an open-and-shut case, Trent delves deeper, uncovering a complex web of deceit, love, and betrayal. His sharp wit and keen observation lead him through a series of twists and turns, but his final conclusion is dramatically mistaken. In a surprising twist, Trent falls in love, which ultimately leads to a profound personal transformation and the unexpected resolution of the case, challenging the very nature of detective work and the fallibility of logical deduction.

In this thrilling adventure novel, a British secret agent is sent to Istanbul during World War I to investigate a German plot to incite jihad in the Muslim world against the Allies. As he uncovers the plot, he must also find and neutralize the mysterious and influential figure known as "Greenmantle." The narrative combines espionage, political intrigue, and high-stakes action as the protagonist races against time to prevent a potential disaster.

The book is a thrilling detective novel set in Paris, revolving around the character of Fantômas, a master criminal with no morals or scruples. Fantômas is a master of disguise, capable of assuming any identity at will, and his criminal activities range from petty theft to murder. The book follows the relentless pursuit of Fantômas by the determined Inspector Juve, leading to a series of exciting and suspenseful encounters.

"The Innocence of Father Brown" is a collection of short stories featuring a Catholic priest who uses intuitive and psychological understanding of human nature to solve mysteries, often surprising those around him with his detective abilities. The priest's unassuming and humble exterior hides a sharp intellect and deep understanding of the human heart, making him an unlikely but effective sleuth. His adventures take him around the world, solving crimes that baffle the police and the public.