'Good evening, sir.' He leaned down into the window and gave me and the car a gentle once-over.

It always pays to be polite. 'Evening, officer. How can I help?'

'There's been an incident at a hotel called the Traveller's Rest on the A10. About fifteen minutes ago. You haven't come that way, have you?'

'No, I haven't,' I told him. 'I've come from Clavering. I'm on my way to London.'

He nodded understandingly, and then looked at me again. You could tell that for some reason he wasn't entirely convinced, although I don't know why. I'm not the type who arouses suspicions. I genuinely look like a nice guy. There shouldn't have been any alarm bells.

But there were. Maybe I'd just met the new Ellery Queen.

'Have you got any identification, sir? Just for the record.'

I sighed. I didn't want to have to do this because it could well cause me a lot of long-term problems, but I didn't see that I had much choice.

For a split second I baulked. But a split second was all I had.

Then I reached into my pocket and removed the warrant card.

He took it, inspected it carefully, looked back at me, then back at the warrant card, just to double check, probably wondering why his instincts were so wrong. When he looked back again, he had an embarrassed expression on his face.

'Detective Sergeant Milne. I'm sorry, sir. I didn't realize.'

I shrugged my shoulders. 'Course you didn't.

You're just doing your job. But if you don't mind, I'm in a bit of a hurry.'