Reading about the dead and the wounded in the terrorist attack on London’s Westminster Bridge – from 10 nations and all walks of life – put me in mind once more of Thornton Wilder’s beloved novel “The Bridge of San Luis Rey.”

It tells the story of five people in 18th-century Peru who die while crossing a footbridge that collapses. A witness who was about to cross, a Franciscan monk named Brother Juniper, is assigned to investigate the tragedy. ...

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