Amanda Harris 
SLIP [EPUB ebook] 

What would you do if your place in your body was not static? What if at any moment you could find yourself in a different life? Miranda Stone has had to deal with slipping in and out of her life every day, and she had the balancing act perfected. Until the day she slipped into Kara and her whole world turned upside down.

SLIP is a fast-paced thriller that will keep you on the edge of your seat.