A faint beam of the moon broke through the clouds, and lit up the white figure once more where it stood close to the sign-post.

And as they watched it seemed to grow, rising higher and higher till its head nearly touched the cross-bars.

Then suddenly, and with a groan, it seemed to drop into the earth, and all was darkness once more.

The boys clung one on each side to the doctor, who trembled hardly less than themselves.

No one dared move, or speak, or utter a sound.
Again the moon sent forth a beam, as the figure once more appeared and slowly rose higher and higher.