When a defective time-jumping device strands Theodore, a teen from the distant future, in the twenty-first century, he is helped by two high schoolers--Jules, who is having time problems of his own, and Gen, an old friend Jules was about to ask out.

After mastering the ability to walk between dimensions, sixteen-year-old Joey Harker and his fellow InterWorld freedom fighters embark on a mission to maintain peace between the rival powers of magic and science who seek to control all worlds.

It has been two years since Joseph Harker first Walked between dimensions, met the alternate forms of himself, and formed a team to protect the Altiverse in the struggle between the vicious forces of magic and science--and now, injured, he has returned to his own dimension, bringing danger with him.

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.

When fifteen-year-old Frannie's father dies, only a mysterious jigsaw puzzle that he leaves behind can help her come to terms with his death.

Reason Cansino must uncover the secret of the magic in her family's background to save the lives of her friends Tom and Jay-tee.

Each of the Travelers returns home to learn the truth about their origins before being reunited for a final, ineveitable confrontation with Saint Dane, whose efforts to control Halla are destroying its very foundations.