‘Can you keep a secret?’ he whispered.

‘Yes, of course,’ the young man said, sounding offended.

‘Then have a seat,’ said William, pointing to the comfortable chair opposite him. He waited for the young man to settle. ‘I’m on holiday and I promised my wife that for the next ten days, I wouldn’t tell anyone I was a detective, because it’s always followed by a stream of questions that turn it into a busman’s holiday.’

‘But why choose a banker as your cover?’ asked the young man. ‘Because I have a feeling you wouldn’t know the difference between a spreadsheet and a balance sheet.’

‘My wife and I gave that question some considerable thought before we settled on a banker. I grew up in Shoreham, a small town in England, in the sixties, and the local bank manager was a friend of my father’s. So I thought I’d get away with it for a couple of weeks.’

‘What else was on the shortlist?’

‘Estate agent, car salesman and funeral director, all of which we were fairly confident wouldn’t be followed by never-ending questions.’

The young man laughed.

‘Which job would you have chosen?’ asked William, trying to regain the initiative.

‘Hitman. That way no one would have bothered me with any follow-up questions.’

‘I would have known that was a cover immediately,’ said William with a dismissive wave of his hand, ‘because no hitman would have asked me if I was a detective. He would have already known. So, what do you really do when you’re not a hitman?’

‘I’m in my final year at Choate, a prep school in Connecticut.’

‘Do you know what you want to do when you leave school? That’s assuming you’re not still hoping to be a hitman.’

‘I shall go to Harvard and study history, before going on to law school.’

‘After which, no doubt, you’ll join a well-known legal practice, and in no time be made a junior partner.’

‘No, sir, I want to be a lawman. After I’ve spent a year as editor of the Law Review, I shall join the FBI.’

‘You seem to have your career well mapped out, for one so young.’

The young man frowned, clearly offended, so William quickly added, ‘I was just the same at your age. I knew I wanted to be a detective and end up at Scotland Yard when I was eight years old.’

‘What took you so long?’

William smiled at the bright young man, who no doubt understood the meaning of the word precocious without realizing it might apply to him. But then William accepted that he’d undoubtedly suffered from the same problem when he was a schoolboy. He leant forward, thrust out his hand and said, ‘Detective Chief Inspector William Warwick.’

‘James Buchanan,’ replied the young man, shaking William’s outstretched hand firmly. ‘Dare I ask how you reached such a high rank, because if you were at school in the sixties you can’t be more than …’

‘What makes you so sure they’ll offer you a place at Harvard?’ asked William, trying to parry his thrust. ‘You can’t be more than …’