L'isola più pericolosa del mondo (Italian), by John Sifert
I am an adult learner of Italian and have just done so online and reading. I plowed through this book in 2 sittings (while my students were reading in Spanish) and it is FANTASTIC.
COMPREHENSIBLE: I understood everything and words I was curious about were always in the glossary. Images were helpful as well.
Full disclosure, I read and loved the Spanish version a couple years ago, but pretty much forgot everything because over 40 brain. However, it may have helped my comprehension.
COMPELLING: It hooks you when you find yourself in a plane crash in the beginning, and it seems there is more peril, confusion and desperation with each passing moment. Humor is sprinkled throughout, and I would not describe it as "scary", but a thriller. I of course love a good twist and was not disappointed!
This was a great read and I highly recommend it - both in Spanish and Italian! The Spanish version is one of my students' favorites. Get yourself a copy and find out why!