Gwen keeps a list of enemies. Not that she'd ever hurt them - she just likes knowing if karma catches up.

So when her childhood bully drowns in sewage, Gwen's quietly satisfied. But then another enemy dies. And another. Soon, everyone who's ever crossed Gwen - right down to the stranger who pushed in front of her in a queue - is meeting a bizarre end.

The police think Gwen's involved, but she's just as terrified. Someone's turning her private grudges into a murder spree - and her newly rebellious daughter could be next . . .