Knee-Knock Rise

Knee-Knock Rise is a children's book written by Natalie Babbitt and published in 1970.

Although the story is intended for children, some of the underlying themes deal with subjects such as the need for invented religion.

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.

At the top of the rise, Egan discovers that there is no Megrimum; the source of the sound is the steam from a boiling spring inside a cave that whistles, moans, and echoes through the rocky cavern when it rains.