'The downward gradient increased as he pressed his foot harder and prayed - prayed against two catastrophes . . . ' April 1941 - the monastery on the heights of Zervos takes on a crucial new significance as the Germans prepare to invade Greece. A Scots secret agent, a Greek patriot and two English soldiers face tremendous odds as they race against time to dent crack Nazi troops the use of this vital observation post. The action begins at sea and continues non-stop overland in a murderous mind-killing creep up the ice-bound mountain, culminating in a sensational, breathtaking, nail-biting finish . . . Colin Forbes 'Has no equal' Sunday Mirror