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A top child protection cop insists the 12-year mystery of missing Madeleine McCann will be solved.

The Sun reports that the claim will be made in a bombshell new Netflix documentary to be released this week.

The Disappearance of Madeleine McCann features 40 experts and key figures in the case, some of who argue the three-year-old was abducted to order by a people trafficking gang and taken to another foreign country.

But the series, which is released tomorrow and took two years to make, also delivers a message of hope, with police claiming they will still solve the 12-year-old mystery.

Julian Peribanez, the private investigator hired by the McCann, explains: “They usually go for lower-class kids from third world countries — that’s the main supplier of these gangs.

“The value that Madeleine had was really high because if they took her it’s because they were going to get a lot of money.”

Large sections of the eight-part series – expected to be a new Netflix phenomenon like Making A Murderer – are devoted to exploring the human trafficking explanation, which regularly involves the supply of a child to desperate wannabe parents or sickening paedophiles.

The theory that she was taken by child-abusers was briefly considered when Maddie disappeared from her family’s apartment in Praia da Luz in Portugal, on the evening of May 3, 2007