Cam Jansen sets out to solve the mystery of Danny's parents' missing car before the famous mystery writer Jim E. Winter, who is signing books at the school, does.
On Green Day, Cam and her classmates discuss ways to protect the environment, but when money collected for the school's new skylights disappears, Cam uses her photographic memory to solve the mystery.
When she notices some bones missing from a dinosaur skeleton exhibited in the museum, a young girl with a photographic memory tries to discover who has been taking them and why.