Richard Osman, who has worked as a screenwriter, producer, and TV host, has a lovely series of novels in the Agatha Christie style called Thursday Murder Club

Richard Osman, who has worked as a screenwriter, producer, and TV host, has a lovely series of novels in the Agatha Christie style called Thursday Murder Club about a group of elderly residents of a retirement community who solve cold cases. One is a retired nurse named Joyce who is constantly fumbling with modernity. After several rejections she ends up with “GreatJoy69” as an Instagram user name, using a nickname she had been given by a doctor who wanted to sleep with her (which she only realizes and regrets not having done so in retrospect), combined with her daughter’s birth year, and is amazed at all her DM’s in such short time.