Rita Marsh is a good person. By day, she runs a care home, looking after the elderly and infirm. By night, she's a vigilante, posing online as young girls and snaring the men who prey on them, exposing them for what they are. Rita has successfully kept her two lives separate for years. But when an old classmate returns from her past, her two worlds start to collide. With both of her selves unravelling, Rita will have to choose between justice and revenge. Is she a force for good - or will she become someone to fear?