The Invention of Morel by Adolfo Bioy Casares

Absolute (surrealist) king Jorge Luis Borges once described this novel from his fellow countryman as having the perfect plot structure. Hight praise. The book follows a fugitive hiding on a deserted island who becomes obsessed with a group of tourists projecting repeating loops of reality. It's an all time story of mystery, exploration, suspense and romance that somehow feels simultaneously hazy and totally grounded.