Saturday

In 1979, 18-year-old Michelle Martinko was found brutally stabbed to death in her car in the parking lot of a shopping mall in Cedar Rapids, Iowa. For decades, the police and her family searched for answers -- who did this and why? But the case grew cold. Thirty-nine years later, DNA evidence from the crime scene finally led to a suspect and a murder trial.

The Donnelly family’s neighbours knew they were unusual. Christopher, a music teacher, and Hannegret, a former midwife, were rarely seen outside the house. The children were home-schooled; banned from having phones or computer games. But no one could guess the violence taking place within their home - until it was too late.