 Overdomineering female police detective Jamie McDowell still tries to run her 19-year old only son Peter s life although he is a builder who lives alone. She strongly opposes his engagement to Kelly Shaw, who he doesn t know very long, and forces him to bring her to diner, where Jamie and mother Susan Shaw repeat that mistake. After Kelly provoked her ex-fiancé Ray Rankin in a bar  to test Peter s love  again, they part in anger. That evening the mothers, who went out together, find Kelly burnt to death in Susan s house; an expert clearly concludes arson. To her horror, Jamie quickly finds the evidence seems to point at one logical suspect: her son Peter...