In 1908, eleven-year-old Innie joins the library club at a settlement house that serves immigrant families of Boston's North End, but when items and money disappear from the settlement house, Innie's past as a troublemaker puts her under suspicion.

Using her photographic memory, Cam Jansen joins Eric in solving the mystery of how some of the school computers were stolen.

When Marie-Grace makes a steamboat trip up the Mississippi River with her father, she meets Wilhelmina Newman, a girl her age traveling alone who carries a secret containing clues to a hidden Gold Rush treasure.

When a puppy who is being trained as a police dog goes missing, third-grader Judy forms a detective agency to solve the mystery, imitating her literary heroine, Nancy Drew.

Because they do not want to be separated, four orphaned children run away and live in an old abandoned boxcar

"Anderson and his friends Greg and Julie have been doing everything they can to avoid the battered trunk full of old military things in the basement of his family's junk shop. Only, staying away seems impossible, and this time Anderson discovers a dusty World War II medic's bag inside the trunk. But who does it belong to?"--Back cover.

Hoping to save their family and the citizens of Ferryport Landing from the evil plans of Mirror, Sabrina and Daphne Grimm seek counsel from the other magic mirrors, who advise them to join forces with the Scarlet Hand.

When the squirrel Tail comes barreling into the chicken coop ranting about a round, shiny, green, big, scary thing in the yard, Dirt, Sweetie, Poppy, and Sugar investigate this strange object.

While the Thea sisters are at the excavation site of a dig at Hierapolis, Professor Brenninger unearths a series of priceless and very old figurines, but the Thea Sisters think the discovery may be a scam and investigate.

When Rebecca starts helping to watch her neighbors' fussy baby while they are moving in, she becomes convinced that they have been victimized by kidnappers that have been operating in their neighborhood.