On a very special hike in the woods, Grandpa tells Caillou the story of their fall family tradition. He explains that when Daddy was a child, he played a fun game while they were out hiking: catching a falling leaf before it touched the ground. Since then, the game has become a tradition and this year, Grandpa asks Caillou to be part of it. Caillou finds it difficult, but after a few tries he finally succeeds in catching his very first leaf! The book includes a game of picture dominoes for more family fun. Who knows, this could be the start of your own family tradition!