‘It’ll all be okay,’ said his father softly, as Arthur turned to watch them out the back window. ‘Sometimes life throws us curve balls and forces us to do things we don’t necessarily want to. Just try to think of it as a little adventure—nothing more, nothing less.’

An unmarked jet had been waiting for them at a small airfield just outside of London. Flanked by two more SUVs, similar to the ones in their convey, the plane had, the moment they were all on board, immediately taxied out to the runway and taken off.

Attempting to work out where they might be going, Arthur had tried to keep track of their route by searching for familiar landmarks on the ground. But no sooner had the aircraft climbed through several large banks of cloud than he’d completely lost his bearings. What he didn’t fail to spot, though, was that after less than an hour in the air, they were no longer flying over land! The words of the blogger had immediately rung in his ears.

And so it was that for the next seven and a half hours their course continued to take them out over open water, finally hitting land again a little after nine o’clock UK time. By now Arthur had worked out with some certainty that wherever it was they were going, it was most definitely in the northwestern hemisphere, because had they been flying east, then it would already have been dark outside. Nose pressed up against the window, he’d watched as a landscape of forests and mountains unfolded in front of them, stretching away to the horizon. In places, it was already buried under blankets of early winter snows.

In between dozing and covertly checking on the cat, who didn’t seem to be having any trouble sleeping the whole way, Arthur had spent quite a large portion of the flight seriously regretting having allowed his mum to talk him out of taking his mobile phone with him. Not only did it have all his games on it, but all his music, too.

‘If you leave it there, then you’ll probably never get it back. And don’t think for a minute that we’ll be buying you another one any time soon if you do. In any case, your father will have his, and a few days away from those games of yours won’t do you any harm, either,’ had been the speech.

As a result, he’d been forced to listen to hours of the general and his father discussing world affairs, all of which seemed to be so far removed from his own life that the only interesting moment had been when his father had attempted to badger him into finally telling them where they were going. The general, though, had smiled apologetically and said that it was top secret.

And so, it wasn’t until the plane had finally begun its descent that Arthur got his first chance to learn something about it. Resembling a kind of town, it was much bigger than he’d been expecting and dominated by several very large buildings, which were themselves flanked by tall tower-like structures. Linked together by networks of over-ground walkways, the whole base, from what he could make out, appeared to have been constructed around a central glass dome. Trying to take in as much of it as he could, he barely noticed that they had landed.

‘So, here we are then. Welcome to T8,’ said the general, as the minivan which had been waiting for them on the tarmac came to a stop inside a hangar. Two soldiers ran up and snapped to attention as he got out.

‘Sir, everything in order, Sir,’ said one of them.

The general nodded.

Stuffed full of racks and containers, the hangar had all manner of vehicles parked along its edges, including, to Arthur’s surprise, several light tanks. A door clanged shut at the far end, and a small group hurried over.

‘Ah, Maria Nikolaevna. A pleasure to see you again,’ smiled the general to the lady dressed in a grey flight suit and cap. ‘Arthur, Maria is going to be your guide and assistant during your stay here. So, if you need anything at all, she’ll be the person to ask.’

‘Hello, Arthur, I am very glad to meet you,’ she said, shaking his hand.

‘And here beside her we have Dr Rubenstein, our head of development here at the facility. You will be working with him on all things concerning the box from this point onwards.’

The elderly, slightly blading man, who was wearing a white technician’s coat with its top pockets crammed full of coloured pens, held out a hand for him to shake. ‘Nice to meet you, young man. Tomorrow will be an exciting day, I’m sure.’

Smiling shyly, Arthur shot a glance at the girl standing behind them. Wearing jeans and a hooded sweater, she had long brown hair and was, he guessed, about his own age.

‘And finally,’ said the general, ‘I’d like to introduce you to my daughter, Sky.’

For an awkward moment the two of them stared at each other, neither one quite sure what to do next.

‘Hey!’ said the girl, the first to react, stretching out a hand.

‘Hi!’ he replied, shaking it.

‘I thought that while you’re here with us that it might be good for you to have someone your own age to talk to. My daughter lives with me at the facility, and I’m sure she gets tired of hanging around with old dogs like me all day.’

‘Oh, you’re not such a bad old dog, Papa.’

‘Yes, well, we wouldn’t want that becoming general knowledge now, would we?’ He winked. ‘So then, now that we’ve all been introduced, I will leave you both in Maria’s very capable hands and give you a chance to rest up before tomorrow. Dr Rubenstein, if you would be so kind as to accompany me, I have a few things which I need to go through with you.’

‘Certainly, General,’ replied the doctor.

‘Follow me, please,’ said Maria, and led Arthur and his father out of the hangar, through a security checkpoint, and into a brightly-lit warren of stairs and ultra-clean corridors. Technicians in white coats like the doctor had been wearing hurried to and fro, barely paying any attention to them.

‘Green is for Propulsion Systems,’ she said, noticing that they were staring at a coloured sign-board at the end of one of the corridors. ‘Red is for Astrophysics, blue is for Biomechanics, and so on. It’s confusing for everyone at first, so don’t worry too much if it feels a bit intimidating.’

‘Yes, it’s quite the labyrinth you have here,’ commented his father.

‘Oh, you have no idea. And this is only what you can see above ground.’

‘Is that right? I wonder what goes on down there then.’

‘I honestly couldn’t tell you,’ she said, smiling at him. ‘That information’s way above my pay grade.’

Taking them up several flights of stairs, she led them down a side corridor and stopped in front of a glass door. Pressing a key card against a sensor, it swished open to reveal a plain but cosy looking entrance hall.

‘Arthur, this is going to be your room over here,’ she said, indicating one of three closed doors. ‘And Craig, your’s is that one there.’ Opening a third set of doors, she stepped aside to allow them to get a look inside. Consisting of a kitchen and table at one end, and sofa, TV, and soft chairs at the other, it was a simple but comfortable living area. ‘As you can see, pretty much everything you could need, so make yourself at home and feel free to help yourself if you get hungry. Provisions have already been prepared for your arrival, and you’ll find them in the refrigerator… Also, there’s a telephone you can use, as your mobile phones, if you have them, won’t work here. Just press the red button on it if you need to get in contact with me for any reason.’

‘Red button,’ repeated his father. ‘Got it.’

‘Now, I hope you’ll understand that, given the nature of this facility, you will not be permitted to leave these rooms without an escort. I apologise if that sounds a little draconian but it’s for your own safety as much as anything.’

And telling them that she would return at 9am the following morning, she wished them a good evening and left.