Tandem

Sixteen-year-old Sasha has only ever known one small, ordinary life. When she was young, she loved her grandfather's stories of parallel worlds inhabited by girls who looked like her but led very different lives. She never believed such worlds were realuntil she finds herself thrust into one against her will. To prevent a war, Sasha must slip into the life of an alternate version of herself, a princess who has vanished on the eve of her arranged marriage. If Sasha fools everyone, she can go home; if she fails, she'll be trapped in another girl's life forever. As time runs out, Sasha finds herself torn between two worlds, two lives, and two young men vying for her love.