It’s Saturday morning. I didn’t want to go to Tesco with Mum and Dad. There was nothing else to do, so I reluctantly joined Jake to scope Granddad through our binoculars. I’m cold and my arms are beginning to ache. We watched the postman deliver letters around the square. And we watched Mrs Flower take her dog for a walk. And we watched a white van drive around the square, deliver a huge parcel to number forty-eight and then drive out again. That’s all that’s happened in over an hour. Jake made spying sound so exciting, but it’s more boring than watching the news on TV.

‘Jake, this is pointless,’ I say. ‘Let’s go and play Fortnite at mine.’

‘No, we have to be patient – something will happen soon. Spies don’t stay in all day. Now tell me what the cards in his wardrobe were like again.’

I take my binoculars down, but Jake’s are still trained on Granddad’s house.

‘I told you, they had a symbol like a hand holding a rifle, and I remember seeing the name Commander Steiner.’

‘Commander Steiner. Who has a name like that?’ asks Jake. ‘Hang on! Felix! Felix!’ He waves his arm at me. ‘Pick up your binoculars. Your granddad’s just come out!’

I lift my binoculars and scan across to Granddad’s house. The front door is open and Granddad’s walking around the garden in his dark suit, which he hardly ever wears.

‘He’s checking no one’s watching. Now he’s bending down,’ Jake whispers like a snooker commentator. ‘What’s he doing? Wait. He’s picking something up.’

‘Yeah, it’s just dog poo, Jake.’ I sigh. ‘He checks every morning.’

‘But we don’t know that. It might just be an excuse to get outside and see what we’re all doing, or check the wires to his surveillance cameras.’

‘He hasn’t got any surveillance cameras.’

‘No, then what’s that? Check the lamppost outside his house.’

I scan left until I see the concrete pole sticking out of the ground. ‘It’s just a lamppost,’ I say.

‘No, it’s not the lamppost,’ Jake says urgently.

‘It’s what’s attached to it.’

I track up the lamppost and see the grey camera that got put up there while we were at school last week.

‘See,’ says Jake. ‘Told you.’

‘But that’s just the camera the council put in to stop people spraying graffiti on people’s fences and breaking into cars!’

‘That’s what they want us to think.’

I take the binoculars down. Jake’s looking at me bug-eyed.

‘Spies get everywhere,’ he says. ‘I looked up on the internet what your granddad told you. There really was a wall.’

‘I know,’ I say. ‘He wouldn’t lie to me.’