The foreigner series, especially the first three novels, are an outstanding achievement.
In 'Foreigner', the subject matter underpinning the - gripping - story line includes communication with an alien mindset; relationships both personal and political; intercultural impact and the exchange, to some extent, of different values.
A unique diplomat is the vital go-between for a lost group of humans and the atevi alien race. For the atevi, diplomatic options include assassination. The characters, human and alien, all have real, convincing personalities, and the action sequences, especially in the later part of the book, are fast moving and enthralling. I defy anyone to read this book, and then not want to read the volumes following!