"The Man Who Knew" by Edgar Wallace unfolds a suspenseful narrative as Robert Vane, a man with an uncanny knowledge of crime, becomes embroiled in a perilous plot. Wallace weaves a tale of intrigue, blending crime, romance, and unexpected alliances. Vane's mysterious abilities make him a target, and the story takes readers on a thrilling journey through the criminal underworld. With plot twists and gripping suspense, the novel explores the consequences of knowledge and the relentless pursuit of justice in a world rife with deception.