What is the law on this? Can you be tried in any country willing to take on the case?
That is why I asked "Where does the crime of murder occur?", I was thinking if the Germans say she was taken back to Germany then the murder could have occurred in Germany.
But the abduction in that scenario would have occurred in Portugal but it is getting too late to charge someone with abduction now.
Given the precedent that the 2005 rape of an American in Portugal by a German suspect (later found guilty) by a German court seemed to have the full co-operation of all law enforcement agencies involved leads me to think that you might be fighting dragons that don't exist.
No objection was raised on those grounds in the European Court.
I don't think it is too late for charges to be brought if there is supporting evidence.
The precedent has been set with the rape case which was outwith the Statute of Limitations in Portugal but not Germany and perhaps with others we know nothing about.
I think if Herr Wolters has enough evidence to enable Madeleine's case to be lawfully tried in Germany where it can be conducted at leisure I don't see any objections being made to that situation.