Mark Donovan, Deputy Chief of CIA’s Prague Station, receives an emergency signal from HVGIMLET, his most important agent. He needs to meet—immediately. Mark arrives at the meeting site just in time to see his agent get arrested by the StB, Czech State Security. 

Half a world away, Rick Keaton is a young CIA Case Officer in Vietnamese language training preparing for his first assignment to Saigon when he receives a note. Hazen needs fresh eyes and wants Rick on his team. Together, they get drawn into the world of counterintelligence, dangles, and moles where there is intrigue behind every door and nothing is what it seems.