Published	May-38 - Oxford University Press [H/B]
Reprints	Oxford University Press - Pyramid Oxford University Press Armada Books Severn House Publishers Knight Books Red Fox [view publishing history]
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Biggles becomes involved in the struggles of an Eastern European country, Maltovia, against their neighbours. Biggles and the team are called to make up the entire airforce of Maltovia. They are forced to face both the enemy in the air along with treachery on the ground.

goodreads summary

The escort fell in on either side of the prisoners, and at a word of command the party moved forward. Down the corridor it marched, and through an open door into a grim-looking courtyard. Across this it proceeded, and 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 and Ginger are persuaded to defend a small middle European country from an aggressive neighbour backed up by an unnamed Big Power.