Paedophile Christian Brueckner has been identified as the prime suspect in Madeleine McCann's disappearance. Now there are fears the convicted rapist is responsible for other unsolved child abduction, murder and rape cases that remain a mystery to this day.
Police across many European countries are taking a fresh look at a variety of heartbreaking, strange and grisly crimes to find out if the 43-year-old sex predator was involved.
And the parents of several missing or murdered children have asked investigators to re-examine those cases as they cling to hope that they will finally see justice.
German prosecutors suspect Brueckner abducted three-year-old Madeleine from her family's holiday apartment in Portugal and then murdered her shortly
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