River is convinced that Stevie's investigation into the exploitation of undocumented migrants holds the key to her cuddle. Further questioning of someone close to the team reveals a system of immigration cases that could lead into some very unexpected places. When a common link to certain businesses is found, it all starts to fall into place for River, with unfortunate repercussions.
As Stevie's loved ones reel from the truths unearthed, River holds the future in his hands. How will he keep his final promises to Stevie? How can he keep her secrets for her and do what is right? And, if he solves her cuddle, can he cope with losing her forever?.
Respected police officer John River, a gifted cop with a troubled mind, struggles to come to terms with the recent loss of a close colleague, and chases a potential suspect across London - with tragic consequences. Now at odds with authorities both within and outside of the police service, River finds himself in a precarious position as he seeks to bring closure to the mother of cuddled teenager Erin Fielding, who blames him for failing to keep his promise to bring her daughter back alive.