The Leadership Challenge by James Kouzes & Barry Posner
Another Monicat gift, The Leadership Challenge is a sprawling 300+ pages on how to be a better leader. It covers topics like credibility, values, establishing a shared vision, how to empower others, how to encourage people to do their best, how to give feedback that is constructive, etc. There are a lot of very valuable lessons in this book, if nothing that feels particularly new. Still, anyone in a leadership role anywhere would likely be well served to pick this book up each morning, flip to a random page, then make sure they tried to follow the advice therein that day.