There is a difference between a sad book, even a desperately sad one, and a depressing book, don't you think? Something about whether the courage and resilience of the human spirit features at all, or whether there is a curmudgeonly, grudging sort of gloom pervading everything. I had a lot of difficulty finishing "Gone Girl", "the addictive no 1 bestseller" by Gillian Flynn. Not that it was altogether grim, but the sheer spite of the Girl in question was chilling - as it was meant to be - and it wasn't too difficult to guess the twist before the ending. It's still on my shelf, but I definitely don't intend to pass it on. Chilling!