Real Tigers (Slough House #3)

When a member of London's Slough House--MI5's stable for disgraced spies, so-called "slow horses"--is kidnapped by a former soldier bent on revenge, the agents must risk treason and breach Regent's Park to steal intel in exchange for their comrade's safety. But the kidnapping is only the tip of the iceberg as they are caught in a conspiracy that threatens not only the future of Slough House, but of MI5 itself.