The escort fell in on either side of the prisoners & at a word of command the party moved forward. Down the corridor it marched & through an open door into a grim-looking courtyard. Across this it proceeded & came to a halt against a wall on the far side.-Biggles glanced at the sky. It was just turning pink with the first flush of dawn. ' If Ginger is going to do the rescue act he hasn't got much time left.' He observed calmly.-Algy said nothing. His face was pale. In the uneasy atmosphere of Europe between the two World Wars Biggles Algy & Ginger are persuaded to defend a small middle European country from an aggressive neighbour backed up by an unnamed Big Power.