Flowers in the Attic by V. C. Andrews

The novel focuses on four siblings who, after the tragic death of their father, are locked away in the attic of their cruel grandmother's mansion as their mother tries to inherit the family fortune. The children endure years of abuse and neglect, and as their mother's visits become less frequent, they must rely on each other for survival. Over time, they form a deeply complex and troubling relationship, leading to a shocking and devastating climax.

The 2181st greatest book of all time