Question of the week: What book have you read recently that helps you at work?

I read "The One Thing" by Gary Keller after it was recommended by someone I follow on social media. While it can get a bit repetitive the overall message to narrow down your focus and put your resources towards a single thing that brings progress has been really helpful to me. It's like a Pareto Efficiency model for the digital age. What book have you read recently that helps you at work?