Claire Fontaine is convinced that her ex-husband killed their teenage daughter all those years back and believes he’s capable of killing again. When she sees him move in with another woman, to play step-father for a girl the same age as the one she lost, Claire tries desperately to warn the new bride of the danger her family is in. But when the woman dismisses her admonishments, she feels she must take matters into her own hands and stop the crime she failed to stop before.