"The 48 Laws of Power." I’ve owned this book for years but never fully went through it — instead, I’d pick it up every so often, reading a law here and there. Reading it cover to cover was a different experience. It really hammers homes how important relationships are, the principles of power, and how people might regularly use it against you. The laws are comprehensive and each accompanying story has many important details — but after the 8th or 9th law I was hooked.