Everywhere I go

After Wren's sister has died in a car crash, the feeling of guilt is overwhelming. Because she was in the car with her. Driving. And she survived. The person she loved most in the world did not.
It's Wren's last year in high school, and she should do what other girls her age do: fall in love, party, have the time of her life. But the thoughts of her younger sister, Ava, who will never be able to experience any of those things, are holding her back.
She writes letters to Ava, first to hold on to her memories, then as an outlet for her grief. What she doesn't expect is someone to write back...