Martin Crusoe. A Boy's Adventure on Wizard Island

A few minutes passed, and Martin, lazily tapping his pencil on paper, seemed to have little interest in sounds. Then suddenly his attitude changed, his back straightened, and a look of passionate interest illuminated his sharp gray eyes. The door of the large room opened, and a boy came in quickly, a boy about the same age as Martin, but as dark and thin as Martin, tall and bright.