Gartner, Ben. Eye of Ra (Series) #bk. 2

Siblings John and Sarah barely made it home last time, but in their next time traveling adventure the challenge really heats up. Surrounded by clashing cultures on the ancient Roman frontier, they must fulfill their quest to unite the emperor with his enemy, an Alemanni barbarian, or risk being stuck in time forever. An action-packed fantasy full of sword fights, chariot chases, fearsome wild animals, and high mountain survival. For graduates of the Magic Tree House looking for a thrilling middle grade page-turner, read Sol Invictus, book two of The Eye of Ra series!

Mode of access: World Wide Web