Who ordered Lionel Crabb’s final dive? And why? Giles and Sarah investigate the possible role of MI6. Was the CIA also involved? Revelations from a former spy and a royal expert implicate some very important figures in Crabb’s disappearance. Who are they? And is this why the affair is still being kept secret?

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Show notes:

The Frogmen, 1949 - BBC Motion Gallery/Getty Images

John Le Carre afterword - Ben Macintyre, A Spy Among Friends

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