Mariah Lyons risks her life to solve the brutal murder of her father, Dr. Jonathan Lyons, a well-respected academic, who in a stroke of luck comes into the possession of an ancient and highly valuable parchment stolen from the Vatican in the 15th century.

"In 1939, a team of workers beneath the Vatican unearthed an early Christian grave. This surprising discovery launched a secret quest that would last decades -- a quest to discover the long-lost burial place of the apostle Peter. From earliest times, Christian tradition held that Peter -- a lowly fisherman from Galilee, whom Christ made leader of his Church -- was executed in Rome by Emperor Nero and buried on Vatican Hill. But his tomb had been...