While participating in The Challenge at Briar Academy, Abby and friends learn that their nemesis is using Briar as headquarters for planning an attack, and that The Ghost has inside help.

From her home in Lidice, Czechoslovakia, in 1942, eleven-year-old Milada is taken with other blond, blue-eyed children to a school in Poland to be trained as "proper Germans" for adoption by German families, but all the while she remembers her true name and history.

"In a terrifying new world, four girls must depend on one another if they want to survive. Just when things have gotten kind of normal for Rosie, she finds hersoef running for her life - again. Only this time she's stuck with her roommates from school: Louisa, who can be okay sometimes; Maddie, who cant' stop complaining; and Evelyn, the girl with a million conspiracy theories. If she weren't so scared, Rosie would be totally annoyed. But one of Evelyn's...

Space cadets Addie, Miya, and prickly Olivia are sent to the planet Rednessis which has been plunged into total darkness, and somehow they must manage to work together to avoid the native reptaliens and solve the problem--especially since they are short a flashlight and a pair of night goggles.

Ten-year-old Star Girl, Adelaide Banks, of the Space Education and Action School, and her friend Miya, Astron Girl, are sent on a mission to the planet Aquare, where the underwater life forms are being poisoned by a purple goo--they must find the source and somehow stop it, even though the substance dissolves their special survival suits.