Photo: FX When Patrick Radden Keefe published Say Nothing: A True Story of Murder and Memory in Northern Ireland in 2018, he felt proud of what he’d written, but as with any long-term project, he wasn’t sure how it would be received — or if anyone would like it. He certainly didn’t expect the acclaim that followed, with the best-seller landing on multiple best-of-the-year lists and and winning the Orwell Prize for political writing. “Nobody was more surprised than me that it found the audience