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Friends Dak, Sera, and Riq use the infinity ring to travel in time to medieval Paris where Viking warriors are attacking the Parisians.

While Europe may be experiencing the Dark Ages--a time of unlearning and ignorance--the Middle East, specifically the city of Baghdad, is a bright center of culture and learning.

Sera has a secret. She's seen the future, and it is a terrifying place.

Dak, Sera, and Riq return to the United States and walk right into a deadly trap.

"World War II is raging across Europe and the Axis and Allied powers are in a stalemate.

Fifth-grader Alex Trumble builds a "dingus"--a time machine--when his brother Stephen is kidnapped by dangerous, evil time-travelers, to get back to the past and into the future to save his family from disaster.

"It looks like science-loving Delia Bean's summer is going to be pretty boring.

When Luke investigates a glow in the woods behind his house, he sees a trio of inept alien henchmen who drop a strange device before leaving.