When her family temporarily moves into a luxury apartment building in 1904 Manhattan, eleven-year-old Samantha tries to discover whether a series of mishaps is related to a curse on the building's owner.

Volunteering with her friend Cecile at a crowded New Orleans orphanage during the yellow fever epidemic of 1853, Marie-Grace discovers that it is not just the orphans who need help.

As yellow fever threatens New Orleans in 1853, Marie-Grace cares for an abandoned baby.

Marie-Grace is excited that a well-known English opera company will perform at the very theater where she takes singing lessons from Aunt Océane, but as she and her friend Cécile help out backstage, they make disturbing discoveries.

"Marie-Grace can't wait to begin her journey up the Mississippi River with her father. The steamboat they're traveling on is the biggest and fanciest boat Marie-Grace has ever seen. It's crowded with all sorts of interesting passengers, including Wilhelmina Newman, a girl her age. Wilhelmina is traveling alone, and she's carrying a secret in one of her trunks--clues to hidden Gold Rush treasure. Marie-Grace and Wilhelmina have to unravel the clues...

In 1754, with her own parents taken captive, twelve-year-old Rebecca must confront her fear and hatred of the Abenaki when a boy raised by members of that tribe is brought to the fort at Charleston, New Hampshire, just before a series of thefts occurs.