Every family has an origin story – for author Jo Piazza (Under the Influence, Wilder) her family's is a murder mystery. For as long as she can remember the Piazzas have told the story of their Sicilian roots going back over a hundred years ago: one by one the sons and then their father sailed off...

Biographer Walter Isaacson reveals the his own origins and the way it shaped how he approached Elon Musk's story.