When a series of accidents and other strange happenings at the Capitol City Natural History Museum lead to rumors that the museum is being haunted by the ghost of a Pterosaur, ten-year-old Wilson Kipper and his friends set out to solve the mystery.

Somebody is vandalizing exhibits at the Capitol City Museum of American History, and it is up to twelve-year-old Raining Sam and his friends to find the culprit before irreparable damage is done.

When Clementine Wim spots a famous painting being carried away from the Capitol City Art Museum, she knows something is wrong. But when she arrives at the museum, the painting is hanging right where it should be. No one believes what Clementine saw, not even her mother, an assistant curator at the museum, or her friends. It's up to Clementine to convince the others and determine fact from forgery before it's too late.