"A strange house appears on Jac's street on the five-year anniversary of her cancer diagnosis, and when she gets trapped inside she will have to confront horrors from her past to find a way out." --

After plummeting through a hole in her backyard and finding herself once again in the room of mysterious jars, eleven-year-old Olive unwittingly releases two of Elsewhere's biggest, most cunning, most dangerous forces.

David, Xander, Dad, and Keal discover that Taksidian wants their house for himself in order to use the time portals to build an empire, and unless they can find his weakness in time, the future of the world itself may be in danger.

"Quirky, tool-wielding Alice Cannoli-Potchnik begins to repair the dilapidated mansion next door--only to discover the old house is home to ghosts, and they need mending, too"--

With their mother still missing after going through a Civil War time portal in their spooky house, and their father in jail under a false accusation, Xander, David, and their younger sister continue to try to bring their mother back, now with the help of an old relative who has turned up unexpectedly.

To save the world from destruction, rescue their kidnapped mother, and battle the evil Taksidian, the King siblings try to control the mysterious portals in their house that send them to different time periods.

Moving into an inherited mansion in Maine with their mother and stroke-afflicted father, three siblings uncover a mystery involving hidden passageways, family rivalries, and healing waters.

In this story told mostly through letters, children's book author, I. B. Grumply, gets more than he bargained for when he rents a quiet place to write for the summer.

"With their last adventure just barely over, the Walker kids thought life would finally go back to normal. But things don?t remain calm for long... especially when the colossus Fat Jagger turns up in San Francisco Bay--and he?s in danger! With the police closing in, the Walkers must figure out how to save their giant friend. When a frost beast is spotted in Santa Rosa--and more mystical creatures start appearing all over America--it?s soon clear that...

“A few hundred yards ahead there is a long wooden bridge that the donkeys will be afraid to cross. But do not worry. After you cross the bridge, the ruins will not be far away.”
 
Cousins Kate, Sam, and Shala quickly see why the donkeys are so afraid to cross the bridge— it’s old and rickety and spans a deep rocky canyon. But they have to get across it. They have to find Katie and Sam’s dad, an anthropologist...