A briefcase with undisclosed contents – sought by Irish terrorists and the Russian mob – makes its way into criminals' hands. An Irish liaison assembles a squad of mercenaries, or 'ronin', and gives them the thorny task of recovering the case.

Trained KGB assassin, Edward Genn (code name ICARUS), worked years ago as a sleeper agent in America. But when the Soviet Union collapsed, he quickly found himself in a foreign country with no one to trust. Determined to escape his muddled existence, Edward tries to start over. He assumes a new identity, starts a family and tries to start his own legitimate business that could potentially pull him out of his world of being a hitman.

Frank Wagner goes deeper undercover to infiltrate Europe's most dangerous Mafia, the Russian-est, consisting of ex - KGB officers.