"Who am I? What am I?"
"You are an experiment, Clara. I'm terribly sorry."
Clara discovers that those she believed to be her family were lying to her for her entire life. Clara runs away, knowing nothing about who she is and how she really came to be connected to angels, in hopes of finding answers and freedom. When she is taken in by Dean and Sam Winchester, she starts to learn the truth.
But Clara is not only being hunted down by the angels. Now that she's on Earth, she's being hunted down by demons, too.
Takes place around season 10, post-demon!Dean, but not following any plot that the writers may have planned.