“I don’t know what you mean.” Billy shifted. “Something like that comes in, you know… We were all working on it. All hands on deck. I mean…” He indicated hugeness with his hands.

“Come come,” said Baron. “You’ve got a way with them, haven’t you?” Baron met his eye. “Everyone says so.”

“I don’t know.” Billy shrugged. “I like molluscs.”

“You are an endearingly modest young man,” Baron said. “And you are fooling no one.”

Curators worked across taxonomies. But it was a standing claim in the centre that Billy’s molluscs in particular were special. The stress could be on either word-it was Billy’s molluscs, and Billy’s molluscs, that kept pristine for ages in their solutions, that fell into particularly dramatic enjarred poses and held them well. It made no sense: one could hardly be any better at preserving a cuttlefish than a gecko or a house mouse. But the joke did not die, because there was a tiny something to it. Though in truth Billy had been pretty cack-handed when he had started. He had shattered his way through a fair few beakers, tubes, and flasks; had splayed more than one dead animal sodden on the lab floor before rather abruptly coming into his skills.

“What’s this got to do with anything?” Billy said.

“It has the following to do with what for,” Baron said. “See we’ve got you down here, or up here, depending which way you hold your map, for two reasons, Mr. Harrow. One, you’re the person who found the giant squid missing. And two, something a bit more specific. Something you mentioned.

“You know, I have to tell you,” Baron said. “I’ve never seen anything like this. I mean I’ve heard of stealing horses before. Plenty of dogs, of course. A cat or two. But…” He chuckled and shook his head. “Your guards’ve got a lot to answer for, haven’t they? I gather there’s a fair old degree of mea culpa-ing going on right now, as it goes.”

“Dane and that lot?” Billy said. “I guess so, I don’t know.”

“I didn’t mean Dane, actually. Interesting you bring him up. I was referring as they say to the other guards. But certainly Dane Parnell and his colleagues, too, must be feeling a bit daft. And of them more later. Recognise this?”

Baron slipped the page of a notepad across the table. On it was a vaguely asterisk design. Maybe it was a burst of radial sunbeams from a sun. Two of the several arms coiled at their ends, longer than the others.

“Yeah,” said Billy. “I drew that. It was what that bloke on the tour was wearing. I drew it for the guy interviewing me yesterday.”

“Do you know what this is, Mr. Harrow?” said Baron. “Can I call you Billy? Do you know?”

“How should I know? But the bloke who had this on, he was with me all the time. He never had any time to go off and do anything, you know, dodgy. I would’ve seen…”

“Have you seen this before?” The other man spoke, for the first time. He gripped his hands as if holding them back from something. His accent was classless and without any regional pitch-neutral enough that it had to have been cultivated. “Does it jog your memory?”

Billy hesitated. “I’m sorry,” he said. “Can I just… Who are you?”

Baron shook his head. The large man’s face did not change but for a slow blink. The woman glanced up from her phone, at last, and made some little tooth-kissing noise.

“This is Patrick Vardy, Mr. Harrow,” Baron said. Vardy clenched his fingers. “Vardy’s helping with our investigation.”

No rank, Billy thought. All the police he had met had been Constable So-and-so, DC This, Inspector That. But not Vardy. Vardy stood and walked to the edge of the room, out of the immediate light, made himself an illegitimate topic.

“So have you seen this before?” said Baron, tapping the paper. “Little squiggle ring any bells?”

“I don’t know,” said Billy. “Don’t think so. What is it? Do I get to know?”

“You told our colleagues back Kensington-side that the man wearing this seemed quote het up unquote, or something?” Baron said. “What about that?”

“Yeah, I told Mulholland,” Billy said. “What were those names you said?” he said to Vardy, who did not answer. “I don’t know whether the bloke was weird or what,” Billy said to Baron. He shrugged. “Some people who come see the squid are a bit…”

“Seen more like that recently?” Baron said. “The, ah, oddballs?” Vardy leaned forward and muttered something in his ear. The policeman nodded. “Any people getting unusually excited?”

“Squid geeks?” Billy said. “I don’t know. Maybe. There’s been a couple in costumes or weird clothes.” The woman made a note of something. He watched her do so.

“Alright, now tell me this,” Baron said. “Has anything strange been going on outside the museum recently? Any interesting leaflets being handed out, any pickets? Any protests? Have you clocked any other interesting bits of jewellery on any other visitors? I know, I’m asking as if you’re a magpie, all googly-eyed at shinies. But you know.”

“I don’t,” Billy said. “I don’t know. It has happened that we get nutters outside. As for this bloke, ask Dane Parnell.” He shrugged. “Like I said yesterday, I think he recognised the guy.”

“We would of course indeed like to have words with Dane Parnell. What with him and Mystery Pin Man seeming like they know each other and so forth. But we can’t.” Vardy whispered something else to him and Baron continued. “Because a bit like the specimen he was paid to look after, and indeed like Pin Man, Dane Parnell’s disappeared.”

“Disappeared?”

Baron nodded. “Whereabouts unknown,” he said. “No one on the phone. Give the dog a bone. Not at home. Why might he disappear, you might ask. We are very keen to have him help us with the old enquiries.”

“You spoken to him?” said the WPC abruptly. Billy jumped in his chair and stared at her. She put her weight on one hip. She spoke quickly, with a London accent. “You talk a lot, don’t you? All sorts of chatting you shouldn’t be supposed to.”

“What…?” Billy said. “We haven’t said more than ten words to each other since he started working there.”

“What did he do before that?” Baron said.

“I’ve got no clue…”

“Listen to him squeak!” The woman sounded delighted.

Billy blinked. He tried to take it in good humour, smiled, tried to get her to smile back, failed. “To be honest,” he said, “I don’t even like the bloke. He’s chippy. Couldn’t be bothered to say hello, let alone anything else.”

Baron, Vardy and the woman looked at each other in speechless conclave. They communicated something with waggled eyebrows and pouted lips, repeated quick nods.

Baron said, slowly, “Well if you should think of anything, Mr. Harrow, do please let us know.”

“Yeah.” Billy shook his head. “Yeah, I will.” He put up surrender hands.

“Good man.” Baron stood. He gave Billy a card, shook his hand as if the gratitude were genuine, pointed him to the door. “Don’t go anywhere, will you? We might want to have another chat.”

“Yeah, I think we will,” the woman said.

“What did you mean ‘Pin Man’s disappeared’?” said Billy.

Baron shrugged. “Everything and everyone’s vanishing, isn’t it? Not that he ‘disappeared’ really; that would imply he was ever there. Your visitors have to book and leave a number. We’ve called everyone you were escorting yesterday. And the gentleman with the sparkle on his lapel…” Baron tap-tapped the design. “Ed, he told your desk his name was. Right, Ed. The number he gave’s unregistered, and no one’s answering.”

“Hie thee to your books, Billy,” Vardy said as Billy opened the door. “I’m disappointed in you.” He tapped the paper. “See what Kooby Derry and Morry can show you.” The words were weird but weirdly familiar.

“Wait, what?” said Billy from the doorway. “What was that?” Vardy waved him away.

BILLY TRIED AND FAILED TO PARSE THE ENCOUNTER ON HIS BEWILDERED way south. He had not been under arrest: he could have left at any time. He had his phone out, ready to do a tirade for Leon, but again for reasons he could not put into words, he did not make the call.