Summoned to war-torn Bosnia to replace a Liaison Officer in the Royal Wessex Regiment, ex-SAS man Jeff Hawkins soon realizes he's been pitched into a task far more dangerous than he had imagined. Hawkins' main role is to keep the UN aid convoys running at all costs. But his new Company commander isn't up to the job. His colleague in Liaison is tied up with the British Secret Service and running his own agenda. The uneasy alliance of local Muslims and Croats is breaking down with the arrival of fundamentalist fighters from Afghanistan. Then there's the matter of mercenaries for hire and the CIA stirring the pot for its own ends. Only the arrival of the winter snow brings a welcome lull to the mayhem. But it brings another vast problem. It's vital that one huge convoy runs the gauntlet of fighting along the icy mountain roads, breaking the siege of Sarajevo with essential provisions and medical supplies before Christmas. Defying all odds, the twin-air horns of a hundred trucks blast defiantly as their giant wheels begin to roll on a journey to hell and back ...