Coraline by Neil Gaiman

Book is in PDF-format.

Shortly after moving into an old house with strange tenants above and below, Coraline discovers a big, carved, brown wooden door at the far corner of the drawing room. And it is locked. Curiosity runs riot in Coraline's mind and she unlocks the door to see what lies behind it. Disappointingly, it opens onto a brick wall. Days later, after exploring the rest of the house and garden, Coraline returns to the same mysterious door and opens it again. This time, however, there is a dark hallway in front of her. Stepping inside, the place beyond has an eerie familiarity about it. The carpet and wallpaper are the same as in her flat. The picture hanging on the wall is the same. Almost. Strangest of all, her mum and dad are there too. Only they have buttons for eyes and seem more possessive than normal. It's a twisted version of her world that is familiar, and yet sinister. And matters get even more surreal for Coraline when her "other" parents seem reluctant to let her leave.

Her attempted escape from this nightmare alternative reality sees Coraline experience a chilling series of ever more bizarre encounters.