 Kima moves on to investigating the leaders of the smuggling ring, but the trail runs dry just as the detail is closing on "The Greek" and his lieutenant Spiros Vondas.Bubbles is arrested by Santangelo near the end of Sobotka case and asks Kima to help get him out of trouble.He turns Kima and McNulty onto investigating the link between East side drug kingpin Proposition Joe and their old target Stringer Bell.