‘There are lots of stories.’ Perez gave a smile and turned slightly to include Willow. ‘That’s the way of ghosts.’

‘I’ve never believed in the supernatural,’ Longstaff said.

‘And now?’

‘Now I can see why people might want to believe. We’re grateful for anything that might maintain that contact.’

‘Had Eleanor been in touch with anyone here in Unst about Peerie Lizzie? Had she arranged to meet someone who claimed to have seen the ghost?’

Longstaff shrugged. ‘She probably talked to Lowrie about it. They’re old friends from her uni days. He’d be a good local contact.’

‘Had she met Lowrie to discuss it? In London perhaps, when the project was still in its initial phase?’

Willow wondered where Perez was going with this. Perhaps he thought Lowrie was the man with whom Eleanor had been seen in the restaurant. But surely Caroline would have recognized her lover, even from the back in a crowded bar?

‘I don’t know.’ Longstaff’s original impatience had returned. ‘And I don’t know how these questions will help us find out who killed Eleanor.’ He had his legs crossed and one foot was twitching, tapping the polished wooden floor in a strange Morse code.

Perez seemed unbothered by the noise, which had set Willow’s nerves jangling, or by the man’s words. ‘Because I understand that Eleanor and Lowrie were very close when they were at university. They had a relationship, didn’t they? So perhaps it would be natural for her to go to him with her questions.’

Longstaff gave a harsh little laugh. ‘Nell had lots of relationships when she was at university. The way she tells it, she worked her way through the whole dramatic society. Lowrie might have thought they had a special thing going, but from her point of view he was just another recreational shag.’ He paused. ‘I still don’t understand how this will help us find her killer.’

The foot began tapping again.

‘I’m sorry to press the point,’ Perez said, ‘but it’s important to find out if Eleanor had made any local contacts – someone she might have arranged to meet, perhaps on the night of her death.’

‘She wasn’t crazy enough to go wandering around in the early hours of the morning to meet a total stranger!’

‘Really?’ Perez gave that smile again. ‘Most of us think of Shetland as a safe place. We leave our doors open and we feel happy to go out alone at night.’

‘One of you killed her!’

‘Really?’ The question repeated itself like the chorus of a song. ‘Most homicides in the UK are committed by people we know. Much more likely, I’d think, that she was murdered by one of her friends.’

Longstaff looked up sharply, but didn’t answer. They sat for a moment staring at each other in silence.