Snap! The letterbox. After a while, you amble on down to check the post. It’s a folded sheet of A4, computer printed. The top half is taken up by a section of text in a jaunty, pseudo-handwritten typeface. 'Hi, my name is Charlotte'.

Charlotte goes on to let you know about something she’s just joined, called Halo. She says it’s like WhatsApp. But ‘private’. For our street. So we can do local things like chase the council, or do street parties. Wait, how’s this different than WhatsApp? Anyway, the name ‘halo’ suggests illumination, perhaps of the crystalline variety? Or of divine grace? Charlotte’s sign off seems to be a tell. While we’re all on it, she says, 'we can also keep an eye out from a safety point of view'.

Look at the bottom half of the A4. A more direct message, in standard sans serif, from James. CEO of Halo. More direct explanation about the app. So you do a little digging. James is also a Director on something called Nay Protect Ltd. Sounds like a security company? Curious, so you join the local Halo. There’s a few of your neighbours there. There’s a function to create your own letter, just like Charlotte did. So where’s Charlotte?

There is no Charlotte. Charlotte is you.