I'm an Arabic professor who learned Icelandic for fun, and then I discovered Arnaldur Indriðason, and have absolutely loved his crime books, especially the Inspector Erlendur series. His books are very popular worldwide, and I've been very happy to be able to access them in the original.

Reading and listening are the ways I learn foreign languages. It's always nice if you can find a book that is just a bit above your current level so that you can both understand without looking up words, but also continue to improve. That is sometimes the challenge!