Dead Head - Season 1 Episode 3 -

Eddie Cass , small-time crook, throws this hatbox into the Thames. With the head still in it. Now everyone reckons he knows who did it. The CID, stinking of scent; the aristocracy warming his legs with their cigars; the girl in a mac and not much else. Trouble is, the only one who seems to know is Dana. His ex. But she's not saying.