Suspenseful novels that you simply cannot put down and you read and read and read to find out the truth or see someone get their comeuppance or...something and then...the story ends. Sort of. I just finished reading two in a row by different authors that did that. In the first one (which I liked so much I left a note at the writer's website thanking her for the evocative details which brought back some nostalgia points for me) the mystery is solved three quarters of the way through, precipitating a need to dash around to save one character who is with the shapeshifting bad guy who may or may not kill him. And then--everyone walks away from each other. And that's it.
In the second novel, a young woman has been tormented for six months by relatives she didn't know she had who are trying to destroy her, not for money or power, but because her aunt's feelings were hurt by the girl's mother--decades ago. The girl's entire family died a long time ago, including her mother and the woman whom she thought was her mother, her father is dead, the great aunt, grandparents--all gone. She has no life, lives with an elderly uncle who disregards her and somehow, this aunt thinks she has to be punished further. (This author has a issues with relatives in general and aunts in particular. I think all of his books end with the evil aunt being responsible for all the horror that has come before.) At the end, she speaks with the other evil relation (evil aunt still being on the loose) and tells them what will happen to them now. Then she walks away.
I'd liked to have had an idea of how she was going to get on with her life and make things better.