‘Said the captain to the rest of the Titanic!’

With a fin visible above the surface and keeping to the edge of the reed beds, the fish led them out deeper than Arthur had ever been before. The water, which had been warm near the shore, soon began to feel cold, and discovering that the jetty had disappeared from view, he began to panic.

‘Cat, how much further?’ he asked nervously.

‘Actually, we’re here already.’

‘Really?’

‘Apparently. And all you need to do is dive down and look under a stone inside the reeds below us.’

‘OK, but that sounds a bit vague. It’s going to show me exactly where, right?’

‘I’m thinking not.’

‘What! Why?’

‘He said that it wasn’t part of the deal.’

‘Of course it was part of the deal! Tell him!’

‘I would but it’s too late. He’s already gone.’

‘Blast!’

Tempted for a moment to just forget it and swim back to the shore as fast as he could, Arthur gazed across the lake at the people swimming.

‘Come on, you can do this,’ he mumbled to himself. ‘It’s not that deep.’

‘That’s right, champ—you’ve got this,’ purred the cat. ‘Now, please hurry up before any of those pickle fish decide that I look like a tasty snack.’

‘Pickle fish? I think you mean pike, and I doubt they’d be interested in you.’

‘Maybe, maybe not, but I bet there are plenty of other monsters lurking in here.’

‘Cat, relax, will you?’

Glancing into the murky water, and unable to see any further than his waist, Arthur took a deep breath and dove down. Although it was only a few metres, the water pressure made it hard for him to reach the bottom, always pushing him back towards the surface. In the end, he had to make half a dozen attempts before he finally found it.

‘Ouch!’ meowed the cat, as Arthur burst out of the water, gasping and tossing something on to the Styrofoam platform.

‘I found it.’

‘Yeah, you don’t say. I swear you just aimed it right at my nose!’

‘No I didn’t. C’mon, what do you reckon, then?’

‘I reckon it looks like a piece of junk.’

‘Noooo, Cat, don’t say that. The fish seemed to think it was important though, didn’t it?’

‘Or did he? Maybe he just said the first thing that came into his little fishy head, to escape a good frying.’

‘OK, but you know he could’ve just lied and swam off.’

‘Doesn’t mean anything. I have a funny feeling that fish might be tricky, like birds.’

Back at the jetty, Arthur hauled himself up and set about examining what he’d found. Jet black and about the size of his fist, at first glance, the box had seemed to be exactly that—just a box. It even occurred to him that perhaps the cat might have been right, after all. But, as he rubbed it clean with the bottom of his T-shirt, a faint edge appeared around the sides of it. Giving the impression of being a lid, there were words written above it.

‘Hey, this is weird,’ he said, showing them to the cat. ‘It says, “To open what is both known yet unknown, speak this word times three.” What do you think that means?’

‘Not a clue, just open it already.’

‘I’ve tried, but it won’t budge. Look.’ And holding it so the cat could see, Arthur tried to pull the top off.

‘My turn, then. Give it here, weedy.’

‘To you?’

‘Well, I don’t see anyone else asking.’

‘All right, keep your whiskers on.’

Placing the box down, Arthur watched as the cat dexterously held it down with one paw and attempted to cut around the faint line of the lid with the other.

‘Yow!’ he hissed, breaking a claw.

‘See! What did I tell you?’

‘But I was close, I reckon.’

‘Sure, you were, Cat. Come on, this is useless. We need some real tools.’

Stuffing the box into his pocket, and gathering his things together, they headed back to the cottage. The big cranes, which had been removing the twisted wreckage from the railway tracks, had gone. Now, with only a few men and machines left to finish up, it was clear it would soon look as though nothing had happened.