In 'The Double Four,' E. Phillips Oppenheim crafts a thrilling tapestry of intrigue and undercover exploits through the exploits of Peter Ruff, set against the early 20th century milieu, replete with the complexities and charm of a pre-war Europe. Ruff, the central character, becomes embroiled in the clandestine dealings of an influential criminal syndicate, offering readers a peek into the shadow...