The Great Ruby Robbery: A Detective Story by Allen Grant is a thrilling mystery novel that follows the story of a young detective named Horace Dorrington. The book is set in London and revolves around the theft of a priceless ruby from a wealthy aristocrat's home. Dorrington is hired by the victim to investigate the case and recover the stolen gem. As he delves deeper into the case, he uncovers a web of deceit and betrayal that leads him to suspect...