A zeppelin leaves Nazi Germany bound for Rio de Janeiro. For those on board it's a luxury holiday, until one of them is murdered in the airship's bathroom. Police Detective Bruno Brückner, travelling on board, is immediately asked to investigate - and soon discovers that the murdered man was not the proud Nazi he claimed to be.

What's more, he was carrying a stash of banned 'degenerate' material. As Brückner interviews his fellow passengers - a wealthy baroness, an antisemitic doctor, a debonair Englishman - his inquiries will uncover a startling story of fake identities, queer love and revenge, where nothing is as it appears, until finally the secret of the 'good Nazi' is revealed...