In a barren land during the Switch, the period when oxygen levels plunged and the green world withered, Alina, Quinn, and Bea leave the dome with two days' worth of oxygen in their tanks and walk straight into the heart of danger.
Prisoner by Alan Gratz. Based on the life of Jack Gruener, this book relates his story of survival from the Nazi occupation of Krakow, when he was eleven, through a succession of concentration camps, to the final liberation of Dachau.
The 39 Clues: Unstoppable Book Breakaway by Jeff Hirsch - Dan Cahill and his sister Amy travel from the hottest to the coldest regions of the world in order to stop someone from using their own power against them.
See Jane Run_Jayne, Hannah. Riley Spencer never thought twice about keeping secrets from her parents, but when she finds a birth certificate with the name Jane O'Callahan hidden in her baby book, she must consider that her parents are lying to her.