In No Rest for Biggles, Al Cox was one of the secretaries of General Homer Mander and was taken prisoner along with him when the V.I.P. aircraft they were on was brought down over the jungles of Liberia. In reality, Cox was a security officer and had only recently joined Mander. He had been in the United States just a month before. Cox told Mander that a prototype aircraft fitted with a secret device which could interfere with magnetic compasses and cause aircraft engines to stop had recently been stolen by a mechanic named Dessalines. Dessalines turned out to be a partner of Christophe, the leaders of the troops who had captured them. The unidentified twin-engined aircraft which had brought down Mander's aircraft and later Biggles turned out to be the stolen prototype was piloted by none other than Dessalines.