Hugo Archibald is a doctor and brings home a wide variety of exotic animal species. The latest animal he brings home is a chimpanzee named Jennie. Dr. Archibald is not home very much, and Andrew feels he does not care about him. And Lea his wife does not want Jennie, and says she makes trouble. But the children take an instant liking to her. Jennie is unique in that she is learning to use and understand sign language. Jennie becomes an important part of Archibald family and Dr. Archibald's son, ...