Harry looked up at the knock. "Come in," he called. He was spread out on his bed writing furiously, stilt in his Muggle attire, though his tie was on the ground, his shoes were off, and his top two shirt buttons were undone.
He thought he had found a charm that would protect Muggle electronics from magic and he thought he knew the spell that powered Wizarding wirelesses' too.
Even with his successes his stomach dropped nervously. What would Ginny think of his note?