Coraline by Neil Gaiman

A young girl named Coraline Jones moves into a new home and discovers a secret door leading to an alternate version of her life, where her "Other Mother" and "Other Father" reside. Although this parallel world seems better at first, she soon realizes that her Other Parents want to keep her there permanently and that they are not as they appear. Coraline must use her bravery and wits to save herself and her real parents, who have been kidnapped by the Other Mother, and free the souls of other children trapped in this alternate world.

The 2461st greatest book of all time