Potter, this is a map to the place where Tyrell is hiding. It's an abandoned warehouse where some of Cross' less savory acquaintances do business. Cross says he's got Matt there. We're on our way there now. He doesn't trust me, so I don't much expect to come out of this in one piece, but on the off-chance I do—try to keep it quiet. I don't want the students to know who I am.
This is supposed to be a note to my girlfriend telling her I won't be home tonight, by the way. You are not "My Sweetheart," no matter what the envelope says, so don't get your hopes up. Be there in two hours. I'll get Matt out by then, so he doesn't get caught in the middle of a fight. We'll meet you back at the Auror office as soon as possible.
Draco