Donald MacKenzie 
Raven After Dark 

When Kirstie Macfarlane’s younger brother is framed for stealing a Van Eyck portrait, she puts the case in the able hands of ex-Scotland Yard Inspector John Raven. Seduced away from his quiet life on the Thames, Raven dives back into the seamy London underworld filled with police corruption and high-handed swindles. Kirstie and Raven soon realise they have more than one opponent and their lives are perilously on the line. 'Donald Mac Kenzie is a born storyteller’ Guardian