On the first day Coraline's family moved in, Miss Spink and Miss Forcible made a point of telling Coraline how dangerous the well was, and they warned her to be sure she kept away from it. So Coraline set off to explore for it, so that she knew where it was, to keep away from it properly.
Coraline 10th Anniversary Enhanced Edition (ed. Harper Collins, 2012) - ISBN: 9780062202796