At 25, Hannah’s life begins falling apart. A digital intruder has made her phone her enemy. Aided by the technology we all rely on, this anonymous person is watching Hannah, threatening her, even pretending to be her. Feeling increasingly unsafe, Hannah goes to the police, but they can’t stop it. Worse, they don’t even recognise it for what it is: stalking. Hannah doesn’t know for sure who is behind it all, but she suspects an older man she met more than two years earlier at London Fashion Week. But when he claims to have been hacked the confusion deepens. To make sense of what’s happening Hannah turns to a woman she’s known since she was seven years-old, and who also happens to be an investigative journalist. Together with her “ex-step mum” Carole Cadwalladr, they piece together something the police couldn’t: the true identity of Hannah’s stalker. They want to confront the stalker for the years Hannah lived in fear, but it means untangling a web of deception spanning continents. On her stalker’s trail, Hannah realises nothing about them is as she first thought.