Edward G. Garrison, better known as Egg, is ready for the Science Club’s trip to the zoo. The best part should be seeing rare Island Foxes, an endangered species on special display. Then the club arrives and discovers the foxes are gone. A missing animal case is not the kind of science lesson Egg expected, but he and his friends start looking for clues right away. They will need sharp eyes, smart questions, and teamwork to figure out what happened before the trail goes cold. The zoo setting makes every habitat, sign, and suspicious moment feel important. This quick-moving chapter book blends a kid-friendly detective story with an animal mystery. It is a fun pick for readers who enjoy zoos, school trips, and stories where friends work together to solve a problem. The endangered species angle adds a gentle real-world note to the adventure.