Here's Amaral's theory!
Gonçalo Amaral in El Mundo: Gerry McCann hid Madeleine corpse in the Beach
http://miscarriageofjustice.co/index.php?topic=1857.msg58322#msg5832_________________________________________________________
Q - So, what are we talking about?
Amaral - About an accident. The child could have fallen from a sofa, could have had an accident with Calpol (a sleeping solution). We never had access to the girl’s medical history, so we don’t know whether she was healthy or not. We can only speculate. There are many very strange details.
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And how do you hide the corpse of a girl of nearly four years old so that no one can't find it?
A – This is what we were investigating when I was dismissed from the case. I want to recall that there is an Irish man who claimed to have seen Gerry McCann with a girl in his arms, on his way towards the beach that same night. That testimony has been hidden. The dogs specialized in finding traces of blood and odour of cadaver, found both in the wall of the apartment and in the boot of the car that the McCann rented 23 days later.
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He wrote a book and he made a media career for himself built on theories such as those above; were they good, bad or average theories he has promulgated for all those years?