An introduction to manatees, looking at the work of marine biologists who monitor the health of manatees, examining the lives of manatees in the wild, and discussing threats to their continued existence.
Three friends in the third grade launch a project to help people, but after talking to their adventurous librarian they end up helping a wounded manatee instead.
While visiting the Everglades National Park with their parents, the Landon children uncover the mystery of dying manatees and learn important lessons about the natural environment.