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British Intelligence is a 1939 spy thriller film that features Boris Karloff as a German spy who tries to sabotage the British efforts during the First World War. Directed by Terry O. Morse, the movie also stars Margaret Lindsay and Bruce Lester as British intelligence officers who are trying to foil the plans of the German spy ring.

The movie opens with a scene that showcases the tension between Britain and Germany as the countries prepare for war. The British government is aware of the existence of a German spy ring that is trying to gain necessary information about the British military plans, and they are making numerous efforts to counteract the German intelligence operations.

As the movie proceeds, the focus shifts to the German spy ring led by Valdar (Boris Karloff), who is tasked with sabotaging the British war efforts. The British intelligence officers, headed by Colonel Gerald Waring (Holmes Herbert), find out about the German spy ring and decide to launch a counter-espionage operation.

This is where Bruce Lester's character, Michael Bruce, comes into the picture. He is a British agent who is recruited to infiltrate the German spy ring and gather information about their plans. Margaret Lindsay plays Elsa Carrington, a British agent who is Michael Bruce's love interest and also helps him in his mission.

With the help of Elsa, Michael Bruce becomes a part of Valdar's inner circle and gradually gains his trust. He is able to provide the British intelligence officers with crucial information that puts a dent in the German spy ring's plan.

The plot thickens as the German spy ring attempts to stage a bombing operation that would destroy a strategic British warship. Michael Bruce is able to alert the authorities in time, and the British navy successfully thwarts the German plan.

The movie comes to an exciting conclusion when Michael Bruce is finally able to reveal his true identity to Valdar, and a high-stakes chase ensues. The scene is tense, and the climax is delivered in a highly satisfying manner.

Overall, British Intelligence is an engaging spy thriller that showcases the dramatic tension between two nations at war. The movie is brought to life by a talented cast that delivers a great performance, especially Boris Karloff, who portrays the villainous German spy Valdar with impressive skill.

The script, although predictable at times, is still able to maintain the suspense and excitement that are necessary for a good spy thriller. The movie is also able to capture the era's mood and attitudes towards the war and espionage, making it a good historical film.

The movie's visual effects, however, might appear to be lacking to modern audiences, and the occasional slow pace might test younger viewers' patience. Nevertheless, fans of the genre will find British Intelligence to be an enjoyable and well-executed movie that stands the test of time.

British Intelligence is a 1940 action movie with a runtime of 1 hour and 1 minute. It has received moderate reviews from critics and viewers, who have given it an IMDb score of 6.1.