After a three-day search effort draws to a close without any sign of a breakthrough, crime correspondent Amy-Clare Martin reports from Praia da Luz on the latest attempt to give the McCann family answ

The initial Portuguese investigation failed to preserve the scene adequately, so the opportunity to gather forensic evidence from Madeline McCann's room at the Ocean Club was lost. Long-term residents remember joining in uncoordinated and ad-hoc searches of the town.

The 3-year-old girl's 2007 disappearance sparked one of the most publicized missing-person investigations in British history. The case is open again.