He could have sworn that her very voice-the voice he had fallen in love with on the beach in Versilia that memorable summer-had become harder and more strident, appending an unspoken ‘take it or leave it’ edge to the most commonplace remark. And he sensed that authentic anger, concealed like the raw hurt of his own mangled bowels, lay just below the surface of quotidian banality, securely rooted and feeding, for the moment, on itself. In short, the affectionate, calm and dependable woman he had fallen in love with had grown distant, capricious and tetchy. So it seemed, at least, but Zen accepted that he was the least reliable of witnesses. A stranger to himself, what could he know of others?

The earlier mention of food pushed him out of his seat and along the carriage, grabbing at each seat-back to keep his balance, precarious everywhere these days. In the buffet car he bought a plastic-wrapped ham roll and a can of beer and carried them over to an elbow-high ledge by one of the windows, where his double was already installed. Maybe she had met someone else when he was in hospital. Or indeed before, during the period when he had been away on his last case. Or before that. It wasn’t unlikely. Both partners are always at least subliminally aware of the balance of power in their relationship, and the fact was that Gemma was younger than him and still very beautiful. Moreover, he knew that she had enjoyed a certain reputation for flightiness before they got together.

He munched his way ravenously through the roll, having lied to Gemma about his ‘huge’ lunch. In his present state, Zen could only achieve anything by breaking the task down into small, achievable subsets and then concentrating wholly on performing them, to the exclusion of all else. Today his chosen assignment had been to get to the consultant in Rome in time for his appointment.