When we are gone, what do people remember of us? Neal MacGregor, an English artist, died alone, prematurely, aged 44, in a stone hen-house that he couldn’t stand up in, where he lived without water, electricity or heating on a remote island. The Gaelic-speaking islanders on the rapidly depopulating island, knew little of Neal during the 8 years he lived there. Who was this Stranger? Was he a British spy recording IRA gun-running routes, as some islanders thought? Was he trying to take control of...