A Safe House (A Stone Barrington Novel, Book 61) by Stuart Woods
 
In this latest adrenaline-charged thriller from #1 New York Times bestselling author Stuart Woods, Stone Barrington takes on a vengeful rival.

Stone Barrington is looking forward to some quiet time in New York City, until he is asked to transport precious, top-secret cargo across the Atlantic. Taking on the challenge, Stone flies off unaware of what—or who—he is bringing with him. 
 
But his plans to lie low are quickly spoiled when a dangerous dispatcher tracks down Stone and his tantalizing mystery guest, intent on payback—and silencing anyone who poses a threat. From the English countryside to the balmy beaches of Key West, Stone is on an international mission to hide and protect those closest to him.