The marriage of Rory and Allison (Jude Law and Carrie Coon) was already frayed. But the spouses were so comfortable with the family's routines, and so immersed in their own pursuits (he's an investment banker, she raises horses and teaches riding), that the warning signs didn't register. Their relocation to England, where Rory grew up, is a black light pointed at a crime scene: it's impossible not to see everything that's gone wrong.