Martin McGuinness assured Rose Hegarty repeatedly that her son Frank would be unharmed if he returned to Derry. Rose believed him and Frank came back. It was a fateful decision and that fate is explored in a new book about spies in the North during the Troubles. Four Shots in the Night examines the Hegarty case and puts it in the context of the intelligence war that played a vital role in bringing the violence to an end. Author Henry Hemming is this week’s guest on the podcast.

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