Dick Rosano 
The Vienna Connection [EPUB ebook] 

Former intelligence expert Darren Priest tries to distance himself from his old life, and turns to a new vocation as a wine and food writer.
He quickly discovers that some things you can’t un-volunteer for. Called to Vienna by the U.S. President, Priest undertakes a covert mission where friend quickly turns into foe.
With numerous enemies threatening his mission, can Priest figure out whom to trust – and keep the Vienna Connection a secret?