Between 1979 and 1993, hundreds of fires were set across Wales and parts of England in the name of Meibion Glyndŵr. Only one person was ever charged and convicted in connection with the attacks.

This Welsh-language series for BBC Sounds sees Ioan Wyn Evans seek new answers to long-standing questions surrounding one of the most turbulent periods in modern Welsh history. Through the eyes of firefighters, journalists, politicians and those directly targeted, the series explores the far-reaching impact of the campaign - and the mystery that still endures.