When betrayal strikes at the heart of the Rubicon team, Marc Dane uncovers the plot of a deadly cadre of black-hat mercenary hackers - to use an unstoppable virtual weapon against vulnerable civilian targets. Is their plan to spread chaos and to sell their skills to the highest bidder? Or is there a deeper, more personal agenda at work? As attacks unfold across the world - crippling power grids, crashing trains, sowing panic and worse - Marc must call on all his skills and ingenuity to track down the mysterious 'Madrigal' before the ruthless hackers' plans bring the world to the brink of war...