Meet Martha at the Dinosaur Museum, she is an archaeologist and periodically goes to excavations every season. Her interest is dinosaur fossils. The rest of the time, the girl works in a museum, where the main expositions are the bones of extinct animals, their reconstruction from the bones found. She systematizes the exhibits, collects dinosaur skeletons, thanks to which we can see what these animals were like during their dawn. Today she came to the museum earlier than usual because the alarm went off. Someone entered the museum at night for no known purpose. The heroine called the police, but before that she wants to find out what was missing in the Dinosaur Museum.