When mummies go missing all over London, eleven-year-old Theodosia puts aside her fight against the Serpents of Chaos to save her father, who is suspected in the thefts, all the while avoiding a string of new governesses.

After getting help for their father, who is cursed with rapid aging, twelve-year-old djinn twins John and Philippa and friends travel through the spirit world in search of Faustina, the only one who can keep their mother from becoming the Blue Djinn, and discover a link to museum thefts and hauntings throughout the word.

Lulu, who likes to dress in a ladybug costume, wants to learn everything when she visits the natural history museum with Grandpa, but as she moves from exhibit to exhibit, she discovers that sometimes you have to slow down to appreciate the wonder of what is around you.

Twelve-year-old Theo uses arcane knowledge and her own special talent when she encounters two secret societies, one sworn to protect the world from ancient Egyptian magic and one planning to harness it to bring chaos to the world, both of which want a valuable artifact stolen from the London museum for which her parents work.

"Curator of paleontology Dr. Simon Nealy never expected to return to his Pennsylvania hometown, let alone the Hawthorne Museum of Natural History. He was just a boy when his six-year-old sister Morgan was abducted from the museum under his watch, and the guilt has haunted Simon ever since. After a recent break-up and the death of the aunt who raised him, Simon feels drawn back to the place where Morgan vanished, in search of the bones they never found....

"A missing dinosaur tooth makes for a massive investigation in this Hardy Brothers Secret Files Mystery. Frank and Joe are excited for their field trip to the Bayport Museum of Natural History with their science club. Not only will they get to see some awesome dinosaur skeletons on display, but they also get to go on their very own fossil dig on the museum grounds. At the dig, fellow classmate Tico uncovers an old dinosaur tooth--even though Tico's...

"It begins in an unnamed city nicknamed "the Fairest", it is distinguished by many things from the river fair to the mountains that split the municipality in half; its theaters and many museums; the Morgue Ship; and, like all cities, but maybe especially so, by its essential unmappability. Dora, a former domestic servant at the university has a secret desire--to find where her brother went after he died, believing that the answer lies within The Museum...

Embarking on a dream vacation in Nantucket, Nancy, Bess, and George attend the opening of an exhibit at a local museum where a vandal has left a threatening message, prompting the girls to investigate numerous suspects.

Alexander's class is going on a sleepover at the Stermont Museum, but something is stealing bright, shiny objects from all over town, including the museum's treasured Ruby Scorpion, and on the night of the visit the young monster hunters finally confront the town's newest monster--a warrior covered entirely by bubble-wrap.