Next of kin - Eric Frank Russell

Scout-Officer John Leeming knew from the very start that his reconnaissance mission deep into enemy territory was likely to be a one-way trip. But when his ship finally let him down and he crashed on a far-distant planet and was captured by tough and ruthless aliens, he knew he wasn?t just going to give up. Armed with a piece of wood, a coil of copper-like wire, his quick wits and an imaginary ally called Eustace, Leeming embarked on a brilliant campaign to gain his freedom - and coincidentally undermined the entire alien war effort!