Was Maddie snatched by monster who killed this little lookalike? That's the dramatic new lead uncovered by British detectives. . . so why are the Portuguese police refusing to investigate?

The 30-strong squad working on the inquiry - codenamed Operation Grange - has identified 20 potential suspects, among them several Britons, as the Mail reported last week. One of the 20, the Mail has learned, was a notorious paedophile who kidnapped and murdered a five-year-old girl in his native Switzerland less than three months after Madeleine McCann (pictured centre) vanished from the Ocean Club resort in Praia da Luz . Urs Hans von Aesch (right), 67, shot himself dead after poisoning and sexually abusing Ylenia Lenhard (left).