''Detective Ben'' by J. Jefferson Farjeon is a Golden Age mystery featuring Ben, a resourceful Cockney tramp who stumbles into crime, becoming an accidental detective who thwarts international conspiracies with humor and thrills, starting with finding a dead man on a bridge and getting entangled with a mysterious woman and dangerous spies in Scotland. It's a fast-paced adventure blending sharp wit, quirky characters, and suspenseful plots, typical of Farjeon's style.