From behind bars, a suspect in a high-profile case issues a bold challenge, questioning the evidence against him in a mysterious disappearance.

The chief suspect in the disappearance of Madeleine McCann has launched a defiant taunt at police, m (Image: Phil Harris)

The chief suspect in the disappearance of Madeleine McCann has launched a defiant taunt at police, mocking the case against him from behind bars.

Christian Brueckner, currently serving time in a German prison, has issued a handwritten letter in which he boldly dismisses the evidence — or lack thereof — against him.

Published by Bild, the letter adds to growing frustration over the long-running investigation. In it, Brueckner openly ridicules the attempts to link him to the three-year-old’s disappearance in Praia da Luz, Portugal, in 2007.

He wrote: “Are there any traces of her in my vehicle? Any other traces of her in my possession? Photos? Is there a body? No, no, no.”