Amelie and Janet are in love with the same man: Janet's husband. One knows it; the other doesn't. Or does she?

As bestselling novelist Amelie Ferrar knows, an affair with a married person is like a work of fiction—a kind of spy story with its own rules and customs, negotiations and compromises, and many private rituals. But like any spy story, there will inevitably be a betrayal: something will slip; someone else will find out; someone may even die.

As Amelie falls deeper into her obsession with the man she loves—and his wife—the line between the fiction she writes and the reality she lives begins to blur...and the twisted ending to this story is one that not even she could have seen coming.