September 25, 1818 – the day London made medical history. Guy’s Hospital. A patient is bleeding out. London surgeon James Blundell rolls the dice on an untested idea: take blood from one person, inject it into another. No blood typing, no antiseptic, just urgency, ingenuity, and a syringe. Against the odds, the patient lives. We’ll meet Dr. Blundell, part mad-scientist, part visionary, who turned a desperate gamble into the first successful human-to-human blood transfusion. It’s a story of risk, luck, science, and the moment London learned life could be borrowed.