This time Jack and Annie go to the vast plains of Africa. There are wide rivers, large grassy plain and animals everywhere. Before Jack finds the answer to the third riddle, Annie starts to help thousands of wildebeests migrate to a plain. They get help from an African tribe member. The animals are grazing happily, not knowing that a pack of hungry lions is watching them. Who can save the animals? How can Jack and Annie flee to their Magic Tree House safely?