Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future by Ashlee Vance

Mr. Vance does a detailed and interesting account of Musk, his life and his exploits. He was eventually given full access to Musk and all his friends and family. Even his enemies and his ex-wives cooperated and largely praised him. This is a saga that continues and Musk is underestimated at one's peril.