When a mysterious walk-in to the US embassy in Vienna claims to have critical information about a Russian intelligence operation, he raises eyebrows. But when he asks for Matt Drake by name and calls himself the Irishman, he gets the DIA's premier case officer on a one-way flight.

Matt arrives to find Austria's charming capital lousy with intelligence officers, all swirling around Nolan Burke--a onetime member of the real IRA. But before Matt can debrief Nolan, the Irishman is kidnapped by a Russian direct action team. Now, Matt must find a way to repay the debt of honor he owes Nolan while stopping World War III in the process.