二战后，美国作家马丁应好友哈里邀请到维也纳工作，岂料刚到达目的地就传来了哈里车祸身亡的消息。哈里葬礼上，马丁遇到了当地军官卡洛维，卡洛维很不客气的请他马上离开维也纳。马丁没有理会，决心留下调查出好友死亡的真相。马丁找到哈里的女友斯科姆特小姐一起调查事件的真相。随着调查的深入，他们发现内幕越加扑朔迷离，首先是他们的房东遇害，接着马丁自己发现被人跟踪，而且他查出哈里死的时候还有个第三人在场。于是，一切关键就在于找出这个神秘的第三人。

An evil hyponotist/ventriloquist plots to gain an heiress' millions.

An evil hyponotist/ventriloquist plots to gain an heiress' millions.

Lily is in love, but with a man she has never seen. She and Erich both work as switchboard operators, she in Paris, he in Berlin. They talk to each other every day and now they are hopelessly in love. Finally, they decide to meet up in Paris. Lily has a photograph of Erich and so is surprised when the man who meets her at the station looks nothing like the man she had been expecting. Not realising that the man is an impostor, Lily allows herself to be courted by him. Meanwhile, Erich has mistaken another woman, Annette, for Lily, and ends up seeing far more than he expected to on a first date. The weekend adventure over, Lily and Erich return to their humdrum lives, only to be dismissed by their employers for their unorthodox method of cementing Franco-German relations over the phone. Just when all seems lost, Fate conspires to bring the two young lovers together...

An American is visiting Britain and finds himself in possession of a briefcase full of secret documents that the spies of many different countries seem determined to get.