Slow Horses

Slough House is a dumping ground for British intelligence agents who’ve screwed up a case in any number of ways—by leaving a secret file on a train or blowing a surveillance. River Cartwright, one such “slow horse,” is bitter about his failure and about his tedious assignment transcribing cell phone conversations.

When a young man is abducted and his kidnappers threaten to broadcast his beheading live on the Internet, River sees an opportunity to redeem himself.

Is the victim who he fi…