Turner investigates when a Croatian prostitute is thrown into the path of a moving police car. A trace of the vehicle used in the attack leads Turner to an abandoned warehouse, where he finds a number of trafficked sex workers who are being held against their will. When a number of passports are found at the property, Turner realises that a number of girls are still missing and realises that they could be working in a brothel nearby. When the team's prime suspect does a bunk abroad, Hunter and Nixon are sent to Bucharest to liaise with the Romanian police. Hunter mounts his own operation, but the operation goes badly wrong when he realises a mole has tipped off their prime suspect.