If you are looking for one textbook on financial investment, this book should be on the top of your list. It has very solid and comprehensive coverage of all the major topics in financial investment, from portfolio construction to CAPM to options to global investing. What I like the most is the detailed discussions on the various pros and cons of each model or technique people use in the real world. This book is a little light on math, but there's enough to satisfy casual readers who want some math but don't want to deal with things like linear algebra or stochastic processes. Another excellent feature is the large number of references the authors provide.
I cannot give this book 5 stars because, due to the multi-coauthorship, the chapters can be a little uneven in both readability and level of treatment. One chapter will give you two pages of algebra from the first grade, and the next chapter is packed with discussions that require a deep understanding of economic theory. The audience of this book is a college senior or a first-year master's or Ph.D. student, which may explain some of this unevenness. The book also tends to be wordy at times.
But overall, this is a good textbook that you can learn from as well as reference in the future.