The Thassos Confabulation — Sam Sommer

After summarily being escorted home from the beautiful and historic Dordogne region of France by several members of the FBI, and having been told to never divulge anything about what they've seen or done, David and Chris discover that they've not only inherited a great deal of money from the estate of the late Paul Maxwell, but along with the money, they've also come into possession of a simple, nondescript, brown paper parcel that Paul left for them as part of their inheritance. When David finally pushes Chris to open it, the contents, along with a strange and perplexing letter, send David on a circuitous quest to understand what it all means, never suspecting the outcome would end so frighteningly close to home.