This book is an accessible introduction to Kant's ethics, one you could give to high school students, a "general reader," or, to use a term that will seem even more abstract to you, a lover. Imagine that the last, the object of your nightly categorical petitions, lacked philosophical training (so the prayer was only partially answered) and asked you where she should start in order to understand the eponymous subject of your weakest puns. Stohr's text would be a good recommendation: the writing is clear, the examples are straightforward, and the organization is sensible.
If you are already familiar with Kant's major works, you needn't read this book. However, if you do, you may learn something useful: how to discuss Kant in plain English. And that would be particularly helpful when you decide to leave your hovel made of books, imbibe a bit of courage, and realize chapter 26 ("A Kantian Love Life") with some other unity of apperception whom you fancy. Allicere aude.