They've barely solved the Russian Mafia case when Caplan, Walter and Roxanne find themselves faced with "Baba" Aroudj, head of the Turkish Mafia. As for Vogel, he finds himself in a mess in prison. But that's not enough for Caplan, who wants to definitively put him out of harm's way. Only to get to him, Caplan is going to have to reconnect with the ghost of a very painful personal past.