The descendants

Aubrey had been born into the modern world. Until one day her and her friends are sent back in time for some kind of mission but they dont really know how or why. Aubrey has seen Kingdoms fall and Empires rise. Will Aubrey find her place in this new world or find a way back home to finish her project? There is a prophecy that once went like this "Three of diffrenet origins descendants of those destined will meet and travel like a clock but backwards. One will betray them, one will stay never to return and the other will go back," a few pieces of the prophecy have been lost in time.