Four linked stories of discovery and survival begin with a Paleolithic-era girl who makes the first written signs, continue with Anna, who people call a witch, then a mad twentieth-century poet who watches the ocean knowing the horrors it hides, and concluding with an astronaut on the first spaceship from Earth sent to colonize another world.

Sixteen-year-old Gwen, the newest and final member of the secret time-traveling Circle of Twelve, searches through history for the other time-travelers, aided by friend Lesley, James the ghost, Xemerius the gargoyle demon, and Gideon, the Diamond, whose fate seems bound with hers.

In seventeenth-century Scotland, saying the wrong thing can lead to banishment - or worse. Accused of being a witch, sixteen-year-old Maggie Blair is sentenced to be hanged. She escapes, but instead of finding shelter with her principled, patriotic uncle, she brings disaster to his door. Betrayed by one of her own accusers, Maggie must try to save her uncle and his family from the king's men, even if she has to risk her own life in the process. Originally...

When the Sudanese civil war reaches his village in 1985, eleven-year-old Salva becomes separated from his family and must walk with other Dinka tribe members through southern Sudan, Ethiopia, and Kenya in search of safe haven. Based on the life of Salva Dut, who, after emigrating to America in 1996, began a project to dig water wells in Sudan.

After inheriting her uncle's homesteading claim in Montana, sixteen-year-old orphan Hattie Brooks travels from Iowa in 1917 to make a home for herself and encounters some unexpected problems related to the war being fought in Europe.