KneeKnock Rise by Natalie Babbitt (New, 2007, Pbk, 118 pages, Scholastic)

New. ISBN 9780590425391

The story is set in the small village of Instep. Egan, a young boy, has come to visit relatives and attend a fair. The village's people are terrified by the noises that come from the top of a small nearby mountain. No one has ever investigated the source of the sound, but the general rumor is that a thing called the "Megrimum" lives up there, kept at bay only through the use of various charms and offerings.

Teased by his cousin, Egan decides to make a trek up the mountain to investigate the source of the noises. When he discovers what's really up there, he has a hard decision to make about whether or not to inform the village.