The body of a missing teenager is dredged from the seabed off the Sussex coast, missing vital organs. Soon after, two more bodies are found. Caitlin Beckett, a 15-year-old in Brighton, will die if she does not receive an urgent transplant. When the health system threatens to let her down her mother takes drastic action and goes to an online broker in black-market organs. As DS Roy Grace investigates, he unearths the trail of a gang of child traffickers operating from Eastern Europe. Soon Grace and his team will find themselves in a race against time to save the life of a young street kid, while a desperate mother will stop at nothing to save her daughter's life.