‘Yes. She lives over the shop in Bruton Street. And don’t worry about a taxi. I’m quite sure I have my own conveyance close by.’

Sandilands raised an eyebrow. ‘Ah! The Pumpkin Express! It’s well after midnight. Are you sure it’ll still be there — the rather eye-catching Buick that’s been following you about all evening? Is that what you have in mind? It was at the Yard. It followed us to the hotel. It followed us from the hotel. It’s been at our heels all along the Embankment.’ He enjoyed her surprise for a moment. ‘I’m expecting it to be cheekily parked in the taxi rank when we leave. Now, tell me, Wentworth — who do you know who drives a cream-coloured American sedan?’

‘My aunt sent me out with her chauffeur, sir. She was concerned for my safety.’

‘Prescient lady! Sandilands? Not to be trusted with nieces. Everyone says so.’ Joe grinned and looked at his wristwatch. ‘You’ve got just over an hour. Long enough?’

‘Ample, sir.’

‘Then I’ll hand you over to … what’s his name?’

‘Albert, sir. Albert Moore. He was a sergeant in the London Regiment.’

The Buick was loitering conspicuously in the middle of a line of shiny black cabs, an exotically striped chameleon poised to lick up a row of beetles.

With a swirl of his cape, Joe approached the driver. ‘Albert Moore? Joe Sandilands … how d’ye do? Glad to see you’re on hand, sarge! Your Miss Lily’s had quite an evening. And so, it would seem, have you.’ He leaned forward, elbows on the lowered window, and said confidentially: ‘But it’s not over yet, I’m afraid. Look — could you take her back to Bruton Street and then on to the Yard? And see our girl doesn’t fall asleep on the back seat. We need her fresh, alert and firing on all cylinders. National emergency on our hands tonight!’

Fresh and alert? Lily paused at the door of the ops room at five minutes to three. Was that how she was feeling? Unexpectedly — yes. She’d got her second wind. A strong cup of coffee from the hands of Aunt Phyl, who’d waited up, had sharpened her wits.