What's the most depressing book you've ever read? For me it's probably Fowle's "The Collector".
It's not a depressing book.
It actually scared me a little since in some sense I empathized with the boring personality of the protagonist, and the fact what he thought was an innocent desire to simply have a woman beside him actually masked a lot of violence and confusion on his part. He's one of the finest "bad guys" in literature in my opinion.
Serene and delicate, poetic. Not particularly depressing, just sad in the way that life is inherently sad. A bit melodramatic towards the end. My favourite scene is near the beginning: looking out a train window as it emerges from a tunnel amid snow drowned slopes and villages and...there's something else our that window too, something you won't forget.