But, you guys, I thought the real criminal was Luis. I thought he had access to all the information, from the cafe and from getting along with everyone, and he was such a perfect boyfriend, I figured he had to be the evil one. He also had a little motivation, as the working-class kid with such rich classmates, and his perfectly friendly demeanor would be a perfect cover, too. I was so shocked when he was just a real nice guy.
Also, the ending? Where they pin the whole thing on the message board creep, letting little one off completely? Pure underhanded genius.