"I've worked out the pattern, identified the fail-safes," Weasley skimmed a finger over various sequences of numbers as he spoke, though Draco's eyes were on Cecily. She was smiling, her eyes bright, that subtle look of... he really could only describe it as madness, becoming more evident. "Determined the various alarms, the shadows and the blinds," Weasley continued, "I cannot, however, determine, based on this, what the structure is. Or what the net looks like."