Edward Egg Garrison is excited to bring his camera on a class trip to the caverns. Dark passages, strange rock formations, and underground shadows should make great pictures. They also make a perfect place for a mystery. When trouble begins beneath the surface, Egg and his friends have to pay attention to details in an unfamiliar world. The cave setting turns every sound, path, and clue into something worth noticing, especially when the situation starts to feel less safe than expected. Egg’s photographer’s eye may be exactly what the group needs in a place where one missed detail can matter. This illustrated chapter book blends field-trip adventure with a kid-friendly mystery. It is a good choice for readers who like caves, school trips, and detective stories where curiosity leads the way. The underground setting gives the familiar field trip formula a fresh sense of danger.