Lock In John Scalzi One of the first things that strikes a 2024 reader about John Scalzi 's Lock In is that it takes place after an "influenza-like global pandemic". Covid was bad enough, but the Great Flu of Lock In was substantially worse. It killed 400 million people worldwide. The Great Flu was often followed by meningitis, which in many patients caused permanent brain damage resulting in Locked-in Syndrome . Locked-in syndrome is a real thing, but in the real world it is rare. In Lock In it is called Haden's Syndrome after a famous sufferer, and is quite common: 4.35 million in the USA. Thus far Lock In is grounded in reality. However, Scalzi takes it much further. Haden's patients have neural networks implanted in their brains which allow them to communicate electronically. In particular, a Haden can inhabit a telepresence robot called a personal transport, colloquially called a threep (after C-3PO) or sometim...