At nearly fifteen years of age, Joey Harker learns that he is a Walker, able to travel between dimensions, and soon joins a team of different versions of himself, each from another dimension, to fight the evil forces striving to conquer all the worlds.

Aidan's new friend Antoinette is called to the Realm, but when she arrives to rescue Robby through his Glimpse-twin, the place is in turmoil and she must decide whether to stay loyal to the one true king or join the evil side.

The battle between the knights of good King Eliam and the armies of Paragor the Betrayer for control of the Kingdom of Alleble enters its final phase, and while it looks as though Paragor will triumph, Eliam's allies cling to belief in the ancient prophecy that three witnesses will arrive with the power to seize the victory.

More than half a millennium in the future, Lah Lia is a protected and pampered Pure Girl raised to be sacrificed to the diskos, the mysterious Gates that hover around the pyramid's top. But when a strange boy appears from the Gates just as she is about to be killed, the ensuing chaos provides Lia the chance to escape. Blindly, she jumps through one of the Gates and is launched on a time-spinning journey. But her fate is now irreversibly linked to...

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.

Polly's stay with her grandparents in Connecticut becomes an extraordinary experience as she encounters old friends and mysterious strangers and finds herself traveling back in time to play a crucial role in a prehistoric confrontation.

Fourteeen-year-old Sunni, her stepbrother Dean, and an art-student friend trace the footsteps of a labyrinth built in Blackhope Tower by a mysterious and brilliant sixteenth-century artist, and suddenly find themselves trapped inside his enchanted painting, trying desperately to get out.