Empty World Saga

When her grandmother dies, 13-year-old Christy inherits an old family secret: The pond behind her house is, in fact, a portal to another world. What's more, she learns her grandfather went through the portal when he mysteriously "disappeared" nine years ago. Christy tries to respect her grandmother's final wishes to not go exploring, but when a classmate named Rob falls into the pond, she has to act.

Christy’s parents forbid her from returning through the portal, but her grandfather is still stranded in the Empty World. When Danny and Brad accidentally take a trip into the portal, Christy finds the excuse she needs to disobey her parents and go after them. Unfortunately for Christy, she's stuck with Cory for a traveling companion. Thus begins another journey through the Empty World, looking for the people they've lost and for a way back home.

With the ever-faithful Trevor in tow, Christy defies her mother’s wishes and ventures back to the Empty World. Her father and Detective Lockhart have been missing for months, and she’s determined to bring them home safely. But trouble-maker Cory has his own reasons for wanting to go back, and he bullies Christy and Trevor into taking him along. The search takes them to a mysterious underground city, abandoned by an ancient race. 

Lost technology might let him walk again, but he'll need lost friends to help him get home. Cory delves into the empty world all on his own with just a computer-generated guardian for an ally. He knows that if he's ever going to walk again, he needs to unlock the forgotten secrets of medical technology advanced enough to heal him. Meanwhile, the search party looking for Cory has troubles of its own. Lost in an underground city, Christy and the others have to keep one step ahead of the ancients who are hunting them as they try to track down Cory.

Sent back to Earth, Christy bides her time plotting to go back to the Empty World. She has the means; she just needs to round up as many friends as she can and convince them to go with her. All is not right in the Empty World, and Doug and Mike may not be able to defend the pyramid by themselves. The Ancients have managed to steal the crystal protecting the massive power source contained inside the pyramid. Christy and her friends must track down and restore the crystal or the released black hole won't just destroy the Empty World...the whole universe will be in danger!

When her grandmother dies, 13-year-old Christy inherits an old family secret: the pond behind her house is in fact a portal to another world. What's more, she learns that her grandfather went through the portal when he mysteriously disappeared nine years ago. As Christy undertakes an adventure into a wondrous and dangerous new world full of strange aliens and advanced technology, she’ll need to trust her instincts and rely on the unique abilities of her friends if she wants to lead everyone safely home.