Margo

“How do I know you'll keep your word?" asked Coraline.
"I swear it," said the other mother. "I swear it on my own mother's grave."
"Does she have a grave?" asked Coraline.
"Oh yes," said the other mother. "I put her in there myself. And when I found her trying to crawl out, I put her back.”
― Neil Gaiman, Coraline