Prudence Wright seems to have it all: a loving husband, Davis; a spacious home in Washington, D.C.; and the former glories of a successful career at McKinsey, which now enables her to dedicate her days to her autistic son, Roland. When she and Davis head out for dinner with one of Davis's new colleagues on a stormy summer evening filled with startling and unwelcome interruptions, Prudence has little reason to think that certain details of her history might arise sometime between cocktails and the appetizer course.