Tinker, Tailor, Soldier, Ferret

Bassethwaite's glory days as a code-cracking hub during the Second World War have come and gone, but the tentacles of the current Cold War have reached even as far as this sleepy Northern town (called by some "the Vienna of the North"). Is the mysterious Karola, rumoured to have left Russia for the first time, here to recruit agents? What about their British counterpart 'Control': does he -- or she -- know enough to stop a betrayal? Secrets, lies and double-crossing abound.