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ON the afternoon of September 5, 2012, British cyclist William Brett Martin came upon an extraordinary scene in a lay-by on a mountain road near touristy Lake Annecy.

A BMW – with its engine still running – had been riddled with bullets.

Inside were Saad al-Hilli, 50, his wife Iqbal, 47, and her mother Suhaila Al-Allaf, 74, – all had been shot twice through the head.

The dead body of Sylvain Mollier, a 45-year-old French cyclist, lay nearby. At least 25 bullets had been fired. There were just two survivors, the al-Hillis’ daughters.

Zeena, four, was unharmed having hidden under the legs of her dead mother in the rear footwell of the car and Zainab, seven, had been shot in the shoulder and also suffered a head wound.

The family had been on a camping holiday and from the outset police were baffled by the case.

They investigated numerous theories including the idea that Mr Saad was targeted by a foreign power over his in satellite technology o Mr Mollier, who work the nuclear industry, w real target.

A family dispute wa briefly considered wit Saad’s brother arrested released without charge

A string of other su have since been consid and the theory that a killer was involved.

But the case is still uns with police forced to they may be dealing wi “perfect crime”.