The Thirty-Nine Steps is a 1978 thriller directed by Don Sharp, based on the novel The Thirty-Nine Steps by John Buchan.
Introduction
This version of Buchan's tale starred Robert Powell as Richard Hannay, Karen Dotrice as Alex, John Mills as Colonel Scudder, and a host of other well-known British actors in smaller parts. It is generally regarded as the closest to the novel, being set before World War I. The early events and overall feel of the film bear much resemblance to Buchan's original story, albeit with a few changes such as the introduction of a love interest and a different meaning for the "39 steps". It is well remembered for the famous Big Ben end sequence.
Powell later reprised the role in the ITV series Hannay in 1988 (six episodes) and 1989 (seven episodes).
Plot
In 1914, Prussian spies are everywhere. After a spate of assassinations of important British politicians, a retired British intelligence officer, Colonel Scudder, realises his life and his mysterious black notebook are in danger. He turns to Richard Hannay, a mining engineer who is visiting Britain for a short time before returning to South Africa, who happens to live in a neighbouring apartment. Scudder tells Hannay of a plot by Prussian 'sleeper' agents, who are planning to pre-start World War I by murdering a foreign minister.
Hannay reluctantly gives Scudder shelter in his apartment, despite his initial distrust of him. In the morning, Hannay leaves to purchase Scudder a train ticket to Scotland. Scudder also leaves the apartment to post a parcel, but he is spotted and follows Hannay to the railway station to supposedly give him the black book.
However, before he can reach Hannay, Scudder is murdered and Hannay is framed for the death by the 'sleepers'. Hannay manages to get Scudder's notebook, but this turns out to be a dummy, with only a code in it to find his real book, which he has posted to Scotland. Hannay flees to Scotland on a train, but he is forced to make a daredevil escape on a bridge when police board.
Hannay attempts to solve the mystery whilst on the run from the police, led by Chief Supt Lomas (Eric Porter), and the Prussian agents, led by Edmund Appleton, a Prussian sympathiser highly placed in the British government.
With the aid of Alex Mackenzie and her fiance, David Hamilton, whom Hannay meets on the Scottish moors, claiming to be taking part in a wager, Scudder's book is found, the coded information partly deciphered and the true plans of the Prussian agents are revealed. The agents intend to murder the visiting Greek Prime Minister, leading to unrest in the Balkans and thus World War I, by planting a bomb in parliament. The "Thirty-Nine Steps" refers to the number of stairs in the clock tower of Big Ben and Hannay realises that the bomb is to be set off by the clock at 11.45.
When he reaches the top of the clock tower, the agents have already planted the bomb and have locked the clock room. Hannay is forced to break the glass of the clock-face and physically stop the clock hands, leading to the iconic final sequence.

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　　剧情介绍：在一个游艺场中，记忆大师麦莫里先生正在表演。一个叫安娜的姑娘躲到了一个叫哈奈的加拿大青年的身边，请求与他同行。在他家中安娜告诉他，她要保护英国军方一个重要机密，但一个叫“39级台阶”的外国间谍组织要偷那份情报，他们的头目的小指短了半截。半夜安娜被人杀死，死前在地图上圈出一个地名。哈奈发现自己陷入危险，他决定去那个地方弄清事情。途中警方因安娜死在他家中而对他展开拘捕。他逃出后却偶然遇到那个小指短半截的间谍头目，可因幸运逃过一劫。但警方和间谍组织仍对他穷追不舍，并逮捕了他连带一个他曾经在火车上遇到过现在作为证人出现的姑娘帕梅拉。半途他们发现逮捕他们的并不是警察而是间谍组织的人。他们费尽周折逃了出来，但警方并不相信他们。在游艺场哈奈意识到记得住一切的麦莫里就是情报，在警方要抓他之时，他问麦莫里39级台阶是什么，麦莫里还未说完就被间谍杀死。一切真相大白。
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