Greenwich Park starts with prenatal yoga and ends with a punch to the gut. Katherine Faulkner’s debut is a twisty domestic thriller that unwraps like a baby shower gift with something sinister inside. Helen is pregnant after years of loss, married to a charming architect, and living in a dreamy Victorian home. But when she meets Rachel—a chain-smoking, wine-guzzling hot mess at her prenatal class—her carefully built life cracks. Rachel latches on fast. She’s fun, unpredictable, and clearly hiding something. So is everyone else, apparently. We get multiple narrators (Helen, her chic sister-in-law Serena, and Katie, a dogged reporter), all tied together by a dark event from their Cambridge days. […]