If You Liked A Wrinkle In Time By Madeleine L'Engle...

Circus Mirandus by Cassie Beasley

Even though his awful Great-Aunt Gertrudis doesn’t approve, Micah believes in the stories his dying Grandpa Ephraim tells him of the magical Circus Mirandus: the invisible tiger guarding the gates, the beautiful flying birdwoman, and the magician more powerful than any other—the Man Who Bends Light. Finally, Grandpa Ephraim offers proof. The Circus is real. And the Lightbender owes Ephraim a miracle. With his friend Jenny Mendoza in tow, Micah sets out to find the Circus and the man he believes will save his grandfather.

The only problem is, the Lightbender doesn't want to keep his promise. And now it's up to Micah to get the miracle he came for. 

Masterminds by Gordon Korman

Eli Frieden lives in the most boring town in the world: Serenity, New Mexico. Only thirty kids live in the idyllic town, where every lawn is perfectly manicured and everyone has a pool and a basketball hoop. Honesty and kindness are the backbone of the community. There is no crime in this utopia.

Eli has never left town…. Why would he ever want to? But everything changes the day he and his friend Randy bike to the edge of the city limits. Eli is suddenly struck with a paralyzing headache and collapses. Almost instantly, a crew of security—or “Purple People Eaters,” as the kids call them—descend via helicopter. Eli awakens in the hospital, and the next day, Randy and his family are gone.

As Eli convinces his friends Tori and Malik to help him investigate Randy’s disappearance, it becomes clear that nothing is as it seems in Serenity. As the clues mount to reveal a shocking discovery, the kids realize they can trust no one—least of all their own parents. So they hatch a plan for what could be the greatest breakout in history—but will they survive? And if they do, where do they go from there?

Last day on Mars by Kevin Emerson

It is Earth year 2213—but, of course, there is no Earth anymore. Not since it was burned to a cinder by the sun, which has mysteriously begun the process of going supernova. The human race has fled to Mars, but this was only a temporary solution while we prepare for a second trip: a one-hundred-fifty-year journey to a distant star, our best guess at where we might find a new home.

Liam Saunders-Chang is one of the last humans left on Mars. The son of two scientists who have been racing against time to create technology vital to humanity’s survival, Liam, along with his friend Phoebe, will be on the very last starliner to depart before Mars, like Earth before it, is destroyed.

Or so he thinks. Because before this day is over, Liam and Phoebe will make a series of profound discoveries about the nature of time and space, and find out that the human race is just one of many in our universe locked in a desperate struggle for survival.

Phantom Tollbooth by Norton Juster

For Milo, everything’s a bore. When a tollbooth mysteriously appears in his room, he drives through only because he’s got nothing better to do. But on the other side, things seem different. Milo visits the Island of Conclusions (you get there by jumping), learns about time from a ticking watchdog named Tock, and even embarks on a quest to rescue Rhyme and Reason! Somewhere along the way, Milo realizes something astonishing. Life is far from dull. In fact, it’s exciting beyond his wildest dreams. . . .

Mrs. Frisby and the rats of Nimh by Robert C. O'Brien

Mrs. Frisby, a widowed mouse with four small children, must move her family to their summer quarters immediately, or face almost certain death. But her youngest son, Timothy, lies ill with pneumonia and must not be moved. Fortunately, she encounters the rats of NIMH, an extraordinary breed of highly intelligent creatures, who come up with a brilliant solution to her dilemma.