Agatha, in her late thirties, from a poor background and a temp in a supermarket, knows exactly what her perfect life looks like. It's someone else's: that of the attractive Meghan, wife of a successful TV presenter, who looks after her two children in the London townhouse. Meghan, who walks past Agatha every day without a greeting. And she feels nothing from their covetous glances. Yet the two women have more in common than they realize. For they both have dark secrets, envy and violence lurk in both their lives. And when Agatha no longer wants to just watch, everything gets completely out of control ...