Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Elizabeth Collins Stoddard:  A violent storm continues over the great house at Collinwood , and it has been discovered that two children have disappeared in the middle of this night . While the adults in the house search frantically for them , the children are busy in an old storage room in the abandoned west wing , about to make a startling discovery of their own . _ One _ that will change the course of their lives .

discovery