The Tavernier Stones

When the well-preserved body of seventeenth-century mapmaker Johannes Cellarius floats to the surface of a bog in northern Germany, a 57-carat ruby clutched in his fist, the grisly discovery attracts the attention of criminals, crooks, and thugs across the globe. It ignites a deadly international treasure hunt to find the fabled Tavernier Stones, a stash that reputedly contains some of the world's most notorious missing jewels, including the 280-carat Great Mogul Diamond and the 242-carat Great Table Diamond.

Scrupulously honest Amish-born cartographer John Graf teams up with outlaw prospector and gemologist David Freeman in a ferocious race to be the first to find the treasure and solve the centuries-old Tavernier Stones mystery. In close pursuit of the mismatched amateur sleuths are cutthroats and desperados who'll stop at nothing to possess the legendary jewels not even murder.