After an explosive takedown of a well-placed mole within the CIA, agent Lyndsey Duncan has been tasked with keeping tabs on her newest Russian asset, deadly war criminal Dmitri Tarasenko. She arrives in London fully focused on the assignment at hand, until her MI6 counterpart, Davis Ranford, the very person responsible for ending her last mission overseas after they were caught in a whirlwind affair, personally calls for her. After a suspicious attack on a powerful Russian oligarch's property on Billionaires' Row in the toniest neighbourhood in London, Davis needs Lyndsey to cosy up to the billionaire's aristocratic British wife, Emily Rotenberg. Lyndsey's job is to obtain any and all information related to Emily's husband, Mikhail Rotenberg, and his relationship with the new Russian president, whom CIA and MI6 believe is responsible for the sudden mysterious disappearance of his predecessor, the Hard Man. Fortunately for Lyndsey, there's little to dissuade Emily from taking in a much-needed confidante. After all, misery needs company.