This isn't an introduction to Liechtenstein but rather an in-depth look at the country as of 2003. And as someone who's read a lot about Liechtenstein, I would highly recommend this for its attention to detail.
Beattie covers the history, politics, economy, modern state and the future of Liechtenstein. Some parts of course will be drier to some depending on where your interests lie, but it's still an excellent overview of the country.
I will rate this one because not only did Beattie carry my whole research paper, but also wrote a book I could enjoy! I absolutely must visit Liechtenstein now: probably most idiosyncrasies—my favorite category of things in this universe—per square mile (or person).
If you're planning to study Liechtenstein, doesn't matter the specific area, you're gonna need this book. Especially the history of this small but great nation is exquisitely explained, from Prince Hans-Adam I to Prince Hans-Adam II, everything is covered.