Maddie is dead. The investigation and occasional lead are merely a smoke screen. Why was the home office alerted and British Intelligence in Portugal immediately after the news hit? What's up with the pedo doctor friend and pedo Freud helping the family? What's with the parent's bizarre behavior? What about the cadaver dog's positive hits in Maddie's hotel room?
SHE'S DEAD
exhaustive investigation summary: https://www.youtube.com/watch?v=_yYwFnglhtw
(4 hours, but worth it)