The body of a violently murdered baby boy prompts an unprecedented investigation. The police are determined to prove Joanne Hayes did it. But where's the hard evidence?

As the police case against Joanne Hayes unravels, public outcry at police practices leads to an inquiry. But will the mystery of the baby ever be solved?

The unsolved death of a baby and the mistreatment of an innocent suspect send shockwaves across Ireland, as the truth from 1984 finally starts to emerge.