Anyone remember the ITV murder mystery where all those present were cannibals? The detective finds out just as she is about to become an item on the menu. It was interesting because everyone except the detective colluded without any failing or tripping up. I think the writer made out that they became cannibals after surviving a plane crash in the mountains with nothing to eat or drink and so had to meet (meat!) up every year to "remember" the experience.
Is it possible that this applies to the Madeline case? Could Richard Branson have crashed in some lonely place once? Should they check the hotel kitchen for DNA... I dread to think.