Something odd is happening to your phone. The screen keeps going black, the camera turns on by itself, and it keeps making a weird noise, like tv static. You were about to call tech support, but the screen turned black again, this time with a purple question mark in the middle.

Green text appears underneath it. ‘Hello,’ it says. ‘I have your personal information hostage. Unless you solve a riddle, I’ll sell it. What do you say?’