A young, idealist American gets a job as a train conductor for the Zentropa railway network in postwar, US-occupied Frankfurt. As various people try to take advantage of him, he soon finds his position politically sensitive, and gets caught up in a whirlpool of conspiracies and Nazi sympathisers.

A young, idealist American gets a job as a train conductor for the Zentropa railway network in postwar, US-occupied Frankfurt. As various people try to take advantage of him, he soon finds his position politically sensitive, and gets caught up in a whirlpool of conspiracies and Nazi sympathisers.