As Alistair opened the classroom door, he saw the Weasley twins standing outside, still caught in the posture of eavesdropping.
"Uh... Ali, what a coincidence, haha."
Only then did Alistair remember that he had been in too much of a rush today and hadn't checked the Marauder's Map at all, completely failing to notice that the Weasley twins had followed him.
Chapter 19