If you would ask any character a question, what would it be?

If i was able to ask anybody a question in the book it would be Barry because he got shot and nobody knows who it was so its quite suspenseful. Right before he got shot he got a phone call and nobody knows who it was either, so I'm just wondering who it was because they haven't let the secret out. If i can ask another character a question it would be Barry's girlfriend Julie because everyone thinks that she was the one that called Barry to come to the athletic field but everyone has there doubts because she said she didn't call him, they dont know what to believe.