"Old spies grow ridiculous, River. Old spies aren't much better than clowns." Or so David Cartwright used to say, but he forgot to add they can be dangerous too, especially if they've fallen on hard times--as Diana Taverner learns when the past lands on her desk. An operation carried out during the height of the Troubles laid bare the ugly side of state security, and those involved are threatening to expose details. But every threat...