I stood at the checkout counter moving mechanically. This job required no thought, which was good because my mind was zipping through countless scenarios where I could have saved Mila's life. It always came down to two things: I trusted too easily and I wasn't brave enough. I wished I could be like my sister. She seemed so confident and so knowledgeable. I needed to learn from her so nothing like this happened again.

I was the last one in the store again. I hated working last shift, ...