盟军和德国特工纷纷潜入苏格兰的一处村舍内，他们都对住这里的发明家即将完工的投弹瞄准器格外有兴趣A wartime cottage on a Scottish estate becomes a focus of attention when not only the new tenant but a London evacuee and a downed fighter pilot all move in. The interest may not be unconnected with the fact that the landowner is also a key British military inventor. For a start, the butler is obviously a Scotland Yard flatfoot.