Jack and Annie went to the time of the Icy Age wearing bathing suits and goggles so they felt so cold.  They went to a cave with a heap of bones and saw a cave bear sleeping,  They were so scared and escaped from there. They had to find a place to keep them warm. They went to the Cro-Magnon's cave where they found a deer skin clothes.  In the cave they also found a tunnel which  led them to a huge cavern with many animals painted on the walls. One of the pictures on the wall was a man with human arms and legs, reindeer antlers, and an owl face , It seemed to be holding a flute. He was a sorcerer or  Master of Animals who might have led Cro-Magnons into the cave. While Jack and Annie saw the paintings, they found out Peanut had disappeared. So they went out of the cave and followed Peanut's tracks on the snow. Searching for Peanut, they saw a sabertooth on a cliff. Suddenly they fell in a deep hole which was a trap made by Cro-Magnon's hunting for their meal. The Master of Animals helped them out of trap by using a rope pulled by a mammoth and had them climb on the mammoth. The sorcerer gave Jack a flute made of mammoth bone which made Jack and Annie  happy because it started with the letter 'm' as Jack guessed the special things were started with 'm'. On the way back to the tree house riding on  the mammoth's back, they ran into the sabertooth that tried to attack them, but it went away when Jack played the flute making a strange sound. So they could arrive at the tree house safely. And in the treehouse they found  the Pennsylvania Book which could take them to Frog Creek Pennsylvania.  When they were back their home, they were so happy to be in this age where they didn't need to hunt for meal. They had supermarkets around them.