I have run into far too many bleak books lately. One was
The Tiger Claw: A Novel, by Shauna Singh Baldwin. It is horribly over-written--you know that the heroine will be picked up by the Gestapo early in the novel, and she just drags it out and drags it out. The action in the beginning is canceled by this depressing narrative of the heroine entering France for the SOE, and that switches back and forth with the narrative of her in prison in Germany. I don't know if I'll ever finish it.
The book at Amazon
Then I picked up
Three Day Road by Joseph Boyden. It's about two Cree snipers in the Great War (and based on the life of an Ojibwe sniper in the Canadian army in that war). I don't know if I'll finish it, either. It also suffers from being overwritten with a narrative which jumps back and forth. in this case from the arrival of the boys in France and the return of the survivor.
The book at Amazon
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I also recently read a rather bleak novel about the occupation of Germany after the Second World War, this in the British zone near Hamburg. It was based on the experiences of some cousins of the author in exactly that situation. You don't want to be depressed when you read it. It is
The Aftermath, By Rhidian Brook.
Here is a review by The Independent. I made it through that without committing murder or suicide, so maybe you could, too.