MEET THE MAGICAL GUARDIANS! Ava, Sara, and Lily are determined to learn as much as they can about the strange objects of the famous archaeologist Enid Pennington, Ava's aunt. But it's hard to succeed when Lily's little sister, May, follows them everywhere, asking the girls to play with her. Then, a strange figure begins to fly over the city's rooftops, and May complains that a monster is chasing her. The girls and Pepper, Ava's Tibetan terrier, will have to search through a network of secret tunnels to solve this mystery as well.