After ghostwriter Trevor Moore rents an old farmhouse in Fuerteventura, Canary Islands, he moves in to find his muse. But instead of creative inspiration, he discovers a rucksack filled with cash. Who does it belong to, and what should he do with it? Struggling to make up his mind, Trevor gradually finds more clues, and unravels the harrowing true story of a little-known concentration camp that incarcerated gay men in the 1950s and 60s.