Those who have devoted 14 years of their spare time to this Complete Mystery may be forgiven for suspecting that there is a single malign entity at the helm.
We can investigate this through the technique of Information Flow Analysis, and create some rudimentary charts similar to those generated by the ANACAPA system
We focus on the WHO ? questions
Who HAS the information? Who HAD the information?
And if someone now has it who is not a first-hand witness, what is the possible link, what is the route by which the information travelled?
It is irrelevant whether the information is true or even accurate.
Paradoxically it is more easy to track false and invented information, since there is no chance of a third party innocently having discovered or invented it for themselves.
The techniques of the “Canary trap”, and the “Barium Meal Test” are well known and documented in the world of counter-espionage and counter-intelligence, and can be used even in everyday situations.
Marking notes, numbering copies, and typing onto photosensitive paper are well known techniques.
Let us give a simple example from the workplace :–
An employee is suspected of leaking information to the press, and we know the Press are are now in possession of a copy of a document.
I prepare another document.
The original in my possession reads “This document is not to be copied”
The copy for Employee A reads “This document is not to be photocopied.”
The copy for Employee B reads. “This document is not to be photo-copied”
When a copy is found I can then tell whether my secretary has copied it, or whether employee A or B is responsible. Trapped by a hyphen or a full stop.
Let us go back to the beginning
Consider the first [false] story about the forced, broken, smashed and jemmied shutters and the open window. We can be certain that this information got to the press from relatives and friends who in turn got it directly from the McCanns. Because they told us so. On the record. All of them
But even if they had not told us, the McCanns were the only ones in possession of that [false] information, and so it cannot have some from any other source.
This is what they would like us to think. All very direct and straightforward, even though, strangely, McCann supporters deny this is what happened, and insist that no claim about the shutters was ever made.