When a Russian ship docks in Whitby, Kate is called out when a fight breaks out amogst the crew. One of the crew, Vladimir Ivonov, is convinced he has killed his captain, and arrives in Aidensfield. however, Vladimir clashes with an immigration officer, causing Nick to investigate him. Fearing for his future, Vladimir goes missing, and the team fear he may have kidnapped Dr Radcliff's daughter. The case proves to be the biggest the team have ever faced, as they join forces with MI5 and CID to stop a gang of Russians.