Tom's mother died when he was a little child and he was adopted by his aunt(Aunt Polly). Tom, the clever and naughty boy, could not stand the restrain of his aunt and the school, so he often played truant and got into troubles. One night, he and his friend Huckleberry Finn played in the graveyard, and saw a murder by accident. Being afraid of known by the murderers, Tom and Huckleberry went to a deserted island as "robbers" along with some other friends. And so they were believed to be drawn in the river, and they went to attend the "funeral" held for themselves. After thinking long and hard, Tom stand out and pointed out the murderers. Not for long, Tom and his dear girl Betty Keatcher got lost in a grotto and strived for life for three whole days and nights……
At last, they went out the grotto and were saved by villagers. They told the villagers their experiences, and they stemmed the grotto with a huge stone. Tom and the girl told that when they met the murderer Dean Joe, he was already dead. At last, Tom and Huckleberry went back to the grotto and found a fortune there.