Should this author be cashing in on NYC’s ‘killer’ nanny?

Should this author be cashing in on NYC’s ‘killer’ nanny?
Leila Slimani’s novel “The Perfect Nanny” has become a global bestseller, winning critical acclaim for its young Moroccan-French author. It’s a well-told tale written in sparse, economical prose — a gripping read that hit US shelves last week. But its premise left me cold, partly because Slimani, writing from her Parisian aerie, capitalized on a…