请为《尼尔·帕萨恩》这部动画电影写一段简短且吸引人的故事梗概，包括主要角色及故事背景，要清晰、干脆，能够很好地说明电影的情节及背景，但是不要透露过多剧情内容，结尾应留有悬念。
In a Scottish town in 1974, factory workers refuse to carry out repairs on warplane engines in an act of solidarity against the violent military coup in Chile. Four years pass before the engines, left to rust in factory yard, mysteriously disappear in the middle of the night.