Tatum Oser (portrayed as Camila Cabello), is a sixteen year old girl who is about to have her seventeenth birthday without her mother. She lost her Mom when she was only a sophomore in high school, and all she has left is her father. To deal with the death of their loved one, she watches the Dolan Twins to help deal with her depression. When her Dad gives her the biggest birthday present she has ever had, Tatum's life changes when she instantly falls in love with...a twin.