One of the reasons I've never sought out Iris Chang's The Rape of Nanking: The Forgotten Holocaust of World War II, is because I knew she'd committed suicide soon after the book was published. I figured, if the book was depressing enough to make the author lose all hope, then I probably wasn't going to enjoy it either. I had enough of a downer when I was reading sections of A Thousand Splendid Suns, when the bully Rasheed was beating up his wives and almost killing his daughter - and that's a novel, not a body of well-researched history.
But now that I've read an article about Iris Chang and her state of mind at that time, it seems that she was depressed for many other reasons too.
Although I'm still not too keen on reading about the details of the Chinese holocaust at Nanking.