The Time Stones story begins when college student Sarabeth Steinbrenner inherits a rock-crystal pendant bearing an uncanny resemblance to the Viking artifacts called the Visby Lenses. Her unique pendant, however, harbors a mysterious power capable of transporting her and her friends back through time. With this ancestral pendant in hand, Sarabeth begins her journey to the Seven Ancient Wonders of the World in search of clues to a hidden Eighth Wonder … and its treasures. But she must first unlock the secrets of the pendant and uncover the clues to her ancestral treasure before her efforts are foiled by an unexpected adversary.

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Discovered in 11th century Viking graves, the real Visby Lenses possess amazing optical properties that are almost as accurate as those of modern-day lenses. First studied in detail in the 1990s, the Visby Lenses are largely a mystery to scientists, considering the mathematical knowledge and the technology to craft them was thought unknown at the time the lenses were made.