Fascinating (but also grim)

I'm finally reading up on the new movie The Lost City of Z. I had a vague (and 100% incorrect) idea that it had something to do with zombies, but it turns out it is based on David Grann's 2009 nonfiction book of the same name. Grann's book focuses on the story of British explorer Percy Fawcett, who made numerous attempts to find a lost indigenous city in Brazil's Mato Grosso region. Fawcett disappeared in 1925 on another expedition in search of the city, and there are loads of rumors and tall tales about both his fate and those of the various people who attempted to rescue him.