A seemingly chance meeting at the junk, the sign read costume, jewelry bin of Sadie's Variety Store on the Upper West Side of New York, and the two rings discovered there, brings together Brooke and Piper, thirteen-year olds from very different economic worlds of Manhattan. Brooke, a student at Public School 444 and the daughter of two science researchers, lost her mother in a lab accident that remains a mystery a year after the tragedy. Piper attends the private Laurels School on Park Avenue and has moved with her mother to a new luxury high rise near Brooke's more modest apartment. She misses her father who travels internationally for business but has not responded to frequent calls, emails or FaceTime requests. Both girls are puzzled and troubled by unanswered questions regarding the fate of these absent parents.The two rings they now wear take them to the Egyptian Wing of the Metropolitan Museum of Art and the atrium that houses the Temple of Dendur. Using the power of the rings they enter, through the temple, a staircase to an underground passage that leads to a chamber of magic-like technology, deep beneath the reservoir in Central Park. There they meet the mysterious Ms. Thomas and Ms. Nikola who attempt to recruit them to join a century old sisterhood dedicated to aiding New Yorkers in need. Not until they rise to the challenge of saving Piper's headmistress from death by using the wonders of the chamber and the rings, are these two girls drawn into the cause. Each new and more dangerous challenge forces Brooke and Piper to discover unknown talents and tap into unused personal strengths while questioning why they were chosen from so many young New Yorkers.