Ada's Algorithm: How Lord Byron's Daughter Ada Lovelace Launched the Digital Age (2014) by James Essinger
Because I have a husband who works with computers every day and knows them inside and out, I've naturally become more interested in the development of technology and computer history over the past decade plus. In fact, sometimes I know more about the history of computers than he does, but that's only because I try to get my hands on lots of history-of-science-y books cause that's how I roll.
So when I heard about Ada's Algorithm, I couldn't wait until it was released, but then life got in the way, so I only just finished reading it. In this wide-ranging but relatively slim biography/history of Ada Lovelace (daughter of George Gordon, Lord Byron), her friends, and early-19th-century England, Essinger details how this brilliant and inspired woman pursued her mathematics education and ultimately understood more about Charles Babbage's Analytical Engine than Babbage himself.