The Outsiders – Gerald Seymour

Winnie Monks has never forgotten, or forgiven, the death of a young agent on her team at the hands of a former Russian army major turned gangster. Now, years later, she hears the Major is travelling to a villa on the Costa del Sol. For the young British couple housesitting it is supposed to be a carefree break in the sun. But when the secret service team arrives in paradise, everything changes.