The Way To Happiness goes through a number of virtues, values and principles needed for a happy life, such as caring for one's hygiene to not murdering.
I found the book to be extremely simplistic, without any real guidance on how to cultivate a virtue, apart from highlighting the "survival" benefits it brings to the individual, and to society at large.
At one point, the author makes the claim that the reason why criminals commit crimes is because they "can't learn." I believe human beings are slightly more complicated than that. There are a number of reasons for why crimes are committed, and to reduce the problem to an intellectual inability seems far-fetched.
As for the style of the book, I would've preferred the use of the pronoun "you" instead of "one", and thought the expression "true facts" (used throughout the book) was very awkward.
It's useful to consider the different virtues we can cultivate. However, I don't think this book covered them with sufficient depth or breadth.