Bråfalls Väsen is a comprehensible guide to the trolls, gnomes and fearies living nearby the world of humans, but out of sight. It is authored by Charlotte Cederlund who also wrote Bråfalls Hemlighet, the series of books it is based upon (illustrated by Anders Végh-Blidlöv). 
I contributed by making the cover illustration, half the inlay illustrations, as well as coloring all of the images.