More like Flashback Four

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Danger BoySeries
series4 books2001
Time travel and science fiction, adventurous in tone, set in our world.
“A twelve-year-old boy from the twenty-first century, a girl from medieval Alexandria, Egypt, and a super-intelligent young saurian from an alternative Earth--each for different reasons--join together in travels through time and space.”
from the catalogue
Start with Ancient Fire →
Cragbridge HallSeries
series3 books2013
Set in contemporary.
Start with The Inventor's Secret →
Baseball Card AdventuresSeries
series12 books1997
Time travel and science fiction, adventurous in tone, set in north america.
Start with Honus & Me →
Jack Christie AdventuresSeries
series3 books2009
Time travel and science fiction, adventurous and tense in tone, set in our world.
Start with Day of the Assassins →
Infinity RingSeries
series8 books2012
Time travel and science fiction, adventurous in tone, set in our world.
“The first book introduces the trio and follows them as they try to prevent a revolt by the Amancio brothers.”
from the catalogue
Start with A Mutiny in Time →
TimeRidersSeries
series9 books2010
“Because time travel is here, and there are those who would go back in time and change the past.That's why the TimeRiders exist: to protect us.”
from the catalogue
Start with TimeRiders →