Bluestone Four Two

Nick regrets being cocky with a pistol, while Simon and Bird come to blows over a book.

A blast from the past knocks Nick off his game. Bird tries to teach Mary a lesson.

Nick and the Lt Colonel find themselves in an unexpected battle of wills.

Nick and the Lt Colonel find themselves in an unexpected battle of wills.

Bird hatches a plan to stop Nick and Mary going on about each other once and for all.

Graham the robot is stolen, which proves to be useful in Nick's hunt for a Taliban bomber.