Go to the Black Lake.

You stand on the shore of the Black Lake, and look around. The area is deserted. No one, it seems, wants to risk the weather by going outside. Even all the Durmstrang students, who would be used to cold weather, have decided to stay inside the castle or the ship.

You shiver in the cold air, regretting coming here. The shore is particularly cold, since there are no trees to act as windbreakers. You shiver again, and step into the stiller shadows of the trees.

Suddenly, you see a person walk around the shores of the lake. It seems that you have moved out of sight just in time, since the person hasn't seen you. As the person moves closer, you recognise the pale hair and face – Draco Malfoy. Malfoy looks around furtively, then, when he thinks he can't be seen, he hurries into the trees, only a few meters from you. Something about how he holds himself makes you suspicious.