Rex and her best friend Pinky, each the proud possessor of twenty-seven stuffed animals or dinosaurs, find their visit to the museum and its gift shop complicated by Pinky's little sister Amanda.
When Billy Broccoli discovers that his friend Hoover Porterhouse's brain has turned to mashed potatoes during a trip to the museum, he must help Hoover find the words he needs to make a friend.
During a fourth-grade field trip to Portwaller History Museum, Penelope fears that she is losing her best friend, Patsy Cline Roberta Watson, and decides to start her own secret museum so that she will never forget anyone important to her.
Having run away with her younger brother to live in the Metropolitan Museum of Art, twelve-year-old Claudia strives to keep things in order in their new home and to become a changed person and a heroine to herself.
Super-sleuth fourth grader Joe Sherlock must solve the disappearance of a four-thousand-year-old mummy's head from the town's Egyptian museum or Mr. Klopper will lose his job.