The city's air has turned foul; fights break out among the closest of friends; rats attack in broad daylight; and the very bricks and stones of the city are crumbling to dust. When the gargoyles and dragons - guardians of the rooftops - begin tumbling to the ground and shattering into pieces, the Night Creatures turn to Letty Parker and Associates to discover its cause. The only problem is that neither Letty, nor her friends, have the slightest idea where to start. Is a cure to be found in magic or will science save the day? And do Newton and Copernica Clifford, newly arrived in Belvedere Terrace, hold the key to it all?