One of Us Is Lying

I enjoyed this book. The writing was a tad simplistic but it's nothing to complain about.

I had thought that the principal was responsible for his anti-technology crusade. I did not expect Simon to have killed himself. Now that I'm thinking about it though, what did he carry the peanut oil in and where was it? Addy said it had to be cold-pressed, and maybe that's the answer, but I'm not sure what that means. If this is not the answer and he brought in a vial or something and lined his cup while filling it up, where was that vial? The police would have found it either way if it was still on his person or if he threw it out in the library. It would have had his fingerprints on it and this could have been avoided.