Ophelia, a timid eleven-year-old girl grieving her mother, suspends her disbelief in things non-scientific when a boy locked in the museum where her father is working asks her to help him complete an age-old mission.

Although they look scary, Clifford the big red dog learns that dinosaurs in a museum are not real.

Katie cannot resist reaching in and taking a star while studying a Vincent Van Gogh painting in a museum, and soon the stars are floating into other Van Gogh paintings as she races to collect them before the museum guard notices.

A.J.'s teacher, Ms. Krup, helps make his sleepover at the natural history museum fun and exciting.

Fluffy the class guinea pig joins the students on a trip to the museum, where he carefully studies the exhibits and imagines tracing his ancestry back to the dinosaurs.

"Orphans Philippa, Sam, Thomas, and Max must find out who stole a valuable artifact in order to save to save their home, Dumfrey's Dime Museum of Freaks, Oddities, and Wonders"--

Science-loving Delia Bean is expecting to have a pretty boring summer vacation, but when her Uncle Lyndon offers her an internship in his Earth Time Museum, everything begins to look better.

While participating in a Revolutionary War reenactment, Frank and Joe learn that there has been a real casualty and set out to investigate the incident.

Just as Pippa, Sam, Thomas, and Max become free from the danger of Nicholas Rattigan, their home, Dumfrey's Dime Museum of Freaks, Oddities, and Wonders, comes under threat of closure and their friend Siegfried Eckleberger is murdered.

When a diamond goes missing from the Louvre, it is up to nine-year-old Julieta to identify the thief, exonerate her father, and return home to Boston before her baby brother is born. Includes glossary of French and Spanish words and notes about the Regent Diamond, Athena, and works of art mentioned in the book.