Following 3-year-old Madeleine McCann's disappearance, her parents plead with both the public and police for answers.

While the investigation into Madeleine's disappearance continues, the police begin to suspect that a helpful onlooker may be hiding something.

As the Portuguese police face increased media scrutiny, the McCanns find their account of the night of Madeleine's disappearance called into question.

The use of forensic dogs at the crime scene leads the investigators in a new direction. Later, an allegation rocks Gerry and Kate McCann.

As the world turns against them, the McCanns receive some support. Also, a change in leadership shakes up the investigation.

Private investigators reinvigorate the search for Madeleine. An FBI sketch artist takes another attempt at drawing the chief suspect.

The search for Madeleine takes investigators down a dark path. The McCanns battle Gonçalo Amaral in court.

The media is taken to task for ethical missteps. Despite it being more than a decade since Madeleine was last seen, the McCanns remain fueled by hope.