Connecticut middle-schooler Jake and his older sister Kady are transported by a Mayan artifact to a strange world inhabited by a mix of people from long-lost civilizations who are threatened by prehistoric creatures and an evil alchemist, the Skull King.

Time-travelers Jonah and Katherine are summoned to help another missing child from history, this time Virginia Dare from the Roanoke Colony, but their journey is sabotaged and goes dangerously awry, leaving them in the wrong time period. Includes author's note about the history of Roanoke Colony and Virginia Dare.

"Ashley can't get comfortable in her family's new apartment.  Sometimes she hears a child crying, though no one is near, and everything she does--especially going into the garden or playing with a mysterious white cat--upsets the irritable landlady.  The discovery of an old doll buried in the forbidden garden starts Ashley on a quest to find out who it belonged to, and why it was buried.  The landlady claims the doll is hers.  But an eerie encounter...

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.

A young boy listens to his great-grandmother's tales of Green Knowe as it used to be and, gradually, as past and present blend, he shares the strange adventures of the former inhabitants.

Tolly comes to live with his great-grandmother at the ancient house of Green Knowe and becomes friends with three children who lived there in the seventeenth century.

When young Elana unexpectedly joins the team leaving the spaceship to study the planet Andrecia, she becomes an integral part of an adventure involving three very different civilizations, each one centered on the third planet from the star in its own solar system.

When her parents take in a strange orphan girl with a mysterious past, fifteen-year-old Miranda decides to find out why she seems to have come from nowhere and how she seems to be able to disappear at will.

To stop the coming apocalypse, Matt and his mother Bonnie must travel to seven destinations, each containing a door that opens onto a unique brand of evil that is designed to weaken Bonnie's soul-healing song and bring God's wrath upon the Earth. Opening the final door could doom the planet, yet the remedy they seek is behind that very door.

"Thirteen-year-old Jadie lives in 4-space and works as an Agent for the four-dimensional beings who adopted her after being abandoned as an infant, but when Jadie learns her origin story is a lie she works to uncover the truth."--