She was a wife, a mother, a sister and a daughter. Lyn Dawson had everything to live for, so why did she disappear without a trace 36 years ago? Her husband Chris, a PE teacher, always insisted she abandoned him and their two young daughters to “sort things out”. Days later he moved his teenage lover into the family home. Two coroners concluded Chris Dawson murdered his wife but to this day, he has never been prosecuted. The case has gripped audiences around the world since the release of a new podcast, The Teacher’s Pet, by investigative journalist Hedley Thomas.

• Documentary