‘She died at the scene, yes?’

‘Oh yes.’

‘Go on.’

‘Um…’ He consulted his notebook. ‘On holiday with a friend, Mr Emerson Merckle, both from the Boston area. The doctor’s looking at him now. He was knocked to the ground in the assault and maybe dislocated his shoulder.’

‘We’re quite sure it was an assault, not an accident?’

‘Talk to the bus driver, he’s here too. He described it vividly.’ The cop repeated the driver’s story. ‘Two other eyewitnesses support his account.’

He showed Kathy a diagram he’d made. ‘This one was walking southward on Sloane Street, towards the scene, twenty yards away, and had a clear view. Seemed reliable. The other was coming out of Grosvenor Court, standing on the steps, and happened to look in that direction. Again a clear view. The other pedestrians, and the people on the bus, were more confused. It all happened very fast.’

‘The assailant?’

‘Tall man, according to the bus driver, maybe six-two or three, well built, IC1 or 2, black hair, dark glasses, dark clothes, black backpack. Could be a body builder-the driver said he picked up Mrs Haynes like she weighed nothing. He kept running, up Sloane Street heading north.’

‘Not a bag-snatch?’

‘No. Her bag fell onto the pavement. He didn’t pick it up.’

The bus driver was sitting hunched in the far corner, a plastic cup of tea on the floor at his feet. Kathy introduced herself and took him through his account once again. She was impressed by his conviction, but she’d heard many convincing but mistaken witness accounts before and so she pressed him. Surely the man might simply have pushed the woman aside, or stumbled against her by mistake? But he was unshakeable, speaking as if he still couldn’t quite believe it had happened. ‘No, no, he threw her. The bastard picked her up and spun her around and threw her in front of me. I couldn’t do a bloody thing.’ He shook his head.