Mary Deal 
The Ka [EPUB ebook] 

Archaeology student Chione has vivid dreams about the discovery of an opulent tomb. After the founder of the Institute of Archaeology learns that Chione’s dreams might be connected to events in Egypt, he accepts an offer to examine a mysterious site in the Valley of the Queens.
When they discover a burial chamber, ancient spells transport Chione and her ex-boyfriend, archaeologist Aaron Ashby, 3, 500 years into the past. There, they learn of Tutankhamon and Tauret, a priestess in Pharaoh’s Court.
Soon, Chione and Aaron discover that they have been chosen to play a crucial part in Tauret’s plan.