The Arab Spring has swept through the Middle East and Liz Carlyle and her compatriots in the Thames House's counter-espionage division are racing to investigate arms deals in Yemen. There's a UN embargo forbidding any member country from supplying arms to either side in the uprisings, but Andy Bokus, head of the CIA's London Station, has evidence that the weapons being smuggled into Yemen are not only being sold to both sides, but are coming from...