As disgraced 91-year-old cardinal Theodore McCarrick stood in an American court last week, charged with three counts of indecent assault and battery on a minor, the spectre of the late Scottish cardinal, Keith O’Brien, hovered silently over proceedings. Two elderly men, who once donned scarlet robes and mitres, who reached the pinnacle of Catholic church power, stripped to civvies. McCarrick pleaded not guilty to the charges.

O’Brien, the UK’s then most senior Catholic cleric, and a vocal opponent of gay rights, resigned in 2013 after the Observer revealed details of his sexually inappropriate behaviour with priests in his diocese.

For ex-priest Brian Devlin, one of the four whistleblowers who testified against O’Brien back in 2013, the two cases are clearly linked. “If we hadn’t gone to the Observer back then, the church would have dealt with McCarrick quite differently. Without O’Brien, there would be no church process.”

Devlin has written a book, Cardinal Sin, outlining his experiences…