No Apologies and No Regrets

When the Rusikov twins launch a computer program that sends the NYSE into a "Flash Crash" a fight for control of their source code begins.
Pitting old and new enemies against one another the battle plays out in some of Europe's most scenic cities. The President sends his trusted and secret "fixer", Frank Beretta, to end the conflict, but the loyal ex-Marine is put into a confrontation with an old KGB nemesis, Serge Malroff.
As Beretta closes in on the code known as "Thor's Hammer", Malroff makes a bold play for the upper hand.
Racing to head off a personal tragedy Beretta vows to fulfill a decades old obligation and the result is a fiery and unexpected conclusion for both men.