Intelligently written and executed, this series has taken duo to a new level. It follows on seamlessly from the previous episodes and of course sets up the riddle to be solved (I hope) in series 4. Brain food at it's best.
Great insight from the Japanese perspective. Don't know how accurate it is, I suspect his humanity might be overplayed a tad (after all he was in the business of the military) but the CGI is well done.