The African Queen is a 1951 adventure film adapted from the 1935 novel of the same name by C. S. Forester.  The film was directed by John Huston and produced by Sam Spiegeland John Woolf. The screenplay was adapted by James Agee, John Huston, John Collier and Peter Viertel. It was photographed in Technicolor by Jack Cardiff and had a music score by Allan Gray. The film stars Humphrey Bogart (who won the Academy Award for Best Actor – his only Oscar), and Katharine Hepburn with Robert Morley, Peter Bull, Walter Gotell, Richard Marner and Theodore Bikel.

The African Queen has been selected for preservation in the United States National Film Registry, with the Library of Congress deeming it "culturally, historically or aesthetically significant".

The film currently holds a 100% "Fresh" rating on Rotten Tomatoes, based on 37 reviews.

Plot
Robert Morley and Katharine Hepburn play Samuel and Rose Sayer, brother and sister British Methodist missionaries in the village of Kungdu in German East Africa at the beginning of World War I in August/September 1914. Their mail and supplies are delivered by the rough-and-ready Canadian boat captain Charlie Allnut (Humphrey Bogart) of the African Queen, whose coarse behaviour they tolerate in a rather stiff manner.
 
When Charlie warns them that war has broken out between Germany and Britain, the Sayers choose to stay on, only to witness the Germans burning down the mission village and herding the villagers away. When Samuel protests, he is beaten by a German soldier. After the Germans leave, Samuel becomes delirious with fever and soon dies. Charlie returns shortly afterward. He helps Rose bury her brother, and they set off in the African Queen.

In discussing their situation, Charlie mentions to Rose that the Germans have a gunboat, the Queen Louisa (actually Königin Luise in German), which patrols a large lake downriver, effectively blocking any British counter-attacks. Rose comes up with a plan to convert the Queen into a torpedo boat, and sink the Louisa. Charlie points out that navigating the river would be suicidal: to reach the lake they would have to pass a German fort and negotiate several dangerous rapids. But Rose is insistent and eventually persuades him to go along with the plan.

Charlie hoped after passing the first obstacle that Rose would be discouraged, but she is confident they can handle what is yet to come, and argues that Charlie promised to go all the way. During their journey down the river, Charlie, Rose and the African Queen encounter many obstacles, including the German fort and three sets of rapids. The first set of rapids is rather easy; they get through with minimal flooding in the boat. But Rose and Charlie have to duck down when they pass the fortress and the soldiers begin shooting at them, blowing two bullet holes in the top of the boiler and causing one of the steam pressure hoses to disconnect from the boiler, which in turn, causes the boat's engine to stop running. Luckily, Charlie manages to reattach the hose to the boiler just as they are about to enter the second set of rapids. The boat rolls and pitches crazily as it goes down the rapids, leading to more severe flooding in the boat and also collapsing the stern canopy.

While celebrating their success, the two find themselves in an embrace. Embarrassed, they break off, but eventually succumb and strike up a relationship. The couple decide to take a pit stop to gather more fuel and drain the boat. Back on the river, Charlie and Rose watch crocodiles frolic on the nearby river bank when the third set of rapids comes up. This time, there is a loud metallic clattering noise as the boat goes over the falls. Once again, the couple dock on the river bank to check for damage. When Charlie dives under the boat, he finds the propeller shaft bent sideways and a blade missing from the propeller. Luckily, with some expert skills and using suggestions from Rose, Charlie manages to straighten the shaft and weld a new blade on to the propeller, and they are off again.
 
All appears lost when Charlie and Rose "lose the channel" and the boat becomes mired in the mud amid dense reeds near the mouth of the river. First, they try to tow the boat through the muck, only to have Charlie come out of the water covered with leeches. All their efforts to free the African Queen fail. With no supplies left and short of potable water, Rose and a feverish Charlie turn in, convinced they have no hope of survival. Before going to sleep Rose prays that she and Charlie be admitted into Heaven. As they sleep, exhausted and beaten, heavy rains raise the river's level and float the Queen off of the mud and into the lake which, it turns out, is just a short distance from their location. Once on the lake, they narrowly avoid being spotted by the Louisa.

That night, they set about converting some oxygen cylinders into torpedoes using gelatin explosives and improvised detonators that use nails as the firing pins for rifle cartridges. They then attach the torpedoes through the bow of the Queen, to be used as improvised Spar torpedos. At the height of a storm, they push the Queen out onto the lake, intending to set it on a collision course with the Louisa. Unfortunately, the holes in the bow in which the torpedoes were pushed through are not sealed, allowing water to pour into the boat, causing it to sink lower and eventually the Queen tips over.

Charlie is captured and taken aboard the Louisa, where he is questioned by the captain. Believing Rose to have drowned, he makes no attempt to defend himself against accusations of spying and is sentenced to death by hanging. However, Rose is captured too and Charlie hollers her name, then pretends not to know her. The captain questions her, and Rose confesses the whole plot proudly, deciding they have nothing to lose anyway. The captain sentences her too to be executed as a spy. Charlie asks the German captain to marry them before executing them. After a brief marriage ceremony, the Germans prepare to hang them, when there is a sudden explosion and the Louisa starts to sink. The Louisa has struck the overturned hull of the African Queen and detonated the torpedoes. Rose's plan has worked, if a little belatedly, and the newly married couple swim to safety in Kenya.

Critical reaction
All About Eve received overwhelmingly positive reviews from critics upon its release on October 13, 1950 at a New York City premiere. The film's competitor, Sunset Boulevard, released the same year, drew similar praise, and the two were often favorably compared. Film critic Bosley Crowther loved the film, stating it was "a fine Darryl Zanuck production, excellent music and on air ultra-class complete the superior satire".

Film critic Roger Ebert of the Chicago Sun Times has praised the film, saying Bette Davis' character "veteran actress Margo Channing in All About Eve was her greatest role".  A collection of reviews from the film's release are stored on the website Rottentomatoes.com, and All About Eve has garnered 100% positive reviews there, making it "Certified fresh." Boxoffice.com stated that it "is a classic of the American cinema – to this day the quintessential depiction of ruthless ambition in the entertainment industry, with legendary performances from Bette Davis, Anne Baxter and George Sanders anchoring one of the very best films from one of Hollywood's very best Golden Era filmmakers: Joseph L. Mankiewicz. It is a film that belongs on every collector's shelf – whether on video or DVD. It is a classic that deserves better than what Fox has given it."