"The Man Who Knew Everything" is a crime novel by the legendary writer Wallace Edgar, which transports the reader to an exciting world of investigations and mysteries. The main character, Trevelyan, has an extraordinary intelligence and understanding of human nature, which allows him to uncover complex cases that are overlooked by others. Crimes, mysteries and unexpected turns of events - all this awaits the reader in the pages of this exciting book. "The Man Who Knew Everything" is an exciting story that will keep you in suspense until the last page, revealing a secret that seems beyond the control of even the most inventive mind.