The main plot often involves family secrets, power struggles within a family, and the experiences of the characters in a complex family situation. It may also touch on themes like isolation and the impact of a restricted environment on the characters.
Well, in 'Flowers in the Attic' book story, the kids are kind of imprisoned in the attic. Their mother has her own reasons which are slowly revealed as the story progresses. They endure isolation, hunger at times, and also deal with complex family dynamics. There's a lot of mystery and a sense of claustrophobia throughout the story.