In November 2019, a 19-year-old named Zac Brettler fell from the fifth-floor balcony of a luxury London apartment and into the Thames. His death was ruled a suicide. His parents didn’t buy it—and when they started digging, they discovered that their son had been living a secret life, posing as the heir of a Russian oligarch, consorting with gangsters, and moving through a London that ran entirely on dirty money and underground crime. Patrick Radden Keefe, a staff writer at The New Yorker and the author of Say Nothing and Empire of Pain, turns the story into his new book, London Falling. On Tuesday, he’s in conversation at 92NY with Sarah Jessica Parker, who presented him with the PEN/Audible Literary Service Award. They’re an unlikely but certainly fun pairing. —Jeanne Malle