Martin Sutter - "The dark side of the moon"

Sutter was born in 1948 in Switzerland and is living nowadays in Spain and Guatemala. One of my favorite Sutter books is "The dark side of the moon", a novel describing a manager breaking out of his ordinary business life by accidently falling in love with a Hippie girl and freaking out after eating magic mushrooms with her. One of the mushrooms has irreversibly changed his mind it seems, and so he starts looking for a solution to clear his mind again, therefore turning into a "nature boy". He quits his job, leaves the city, his wife and the girl for good. He starts living in the forests, seeking that very special mushroom again. And one of his former collegues, a hunter, starts hunting him...