Memorable evocation of a bygone era. Two down-and-out boy-and-girl youths try their hand at some detection during the intrigue-filled Post-WWI period in this delightful caper. Even when matters get more serious it seems more fun than actual danger. Sets the tone for many more boy-girl sleuth stories in books and films that followed. The 80s film version of the book is amateurish and avoidable.