Transgender teenager Brianna Ghey was stabbed to death by two 15-year-olds. The killers had been radicalised on the dark web, while the victim was trapped in an online world of her own. Now her mother has become friends with the parent of one of the murderers

The first thing I notice about Esther Ghey is a blossom tree trailing down her left arm to her hand. There is one pink flower on the tattoo. Pink was her daughter Brianna’s favourite colour. If Brianna had got her way, the whole world would have been pink. And just after she was murdered by two teenage schoolchildren in February 2023, Ghey says, the world did briefly turn pink. The local blossom trees filled with the blossomiest blossom she had ever seen. “It really felt she was with us and that she was sending us a sign she was OK,” she says.

Now Ghey has written a book, Under a Pink Sky. It’s a memoir of her and Brianna’s lives, and a manifesto of sorts; a shocking exploration of how deadly smartphones and online spaces can be. It’s also one of the most unflinching, inspirational autobiographies I’ve read, a remarkable cry of hope from the depths of despair.