I. Introduction: Set during World War II, it focuses on a man torn between, in the words of one character, love and virtue. Casablanca, Rick Blaine, exiled American and former freedom fighter, runs the most popular nightspot in town. The cynical lone wolf Rick Blaine comes into the possession of two valuable letters of transit. When Nazi Major Strasser arrives in Casablanca, the sycophantic police Captain Renault does what he can to please him, including detaining Czech underground leader Victor Laszlo. Much to Rick's surprise, Lazslo arrives with Ilsa, Rick's one time love. Rick is very bitter towards Ilsa, who ran out on him in Paris, but when he learns she had good reason to, they plan to run off together again using the letters of transit. Well, that was their original plan …
II. Climax: Europeans who were fleeing from the Germans, sought refuge in America. But to get there they would first have to go Casablanca and once they got there, they had to obtain exit visas which are not very easy to come by. Now the hottest spot in all of Casablanca is Rick's Cafe which is operated by Blaine. Now it seems that two German couriers were killed and the documents they were carrying were taken. Now one of Rick's regulars, Ugarte entrusts to him some letters of transit, which he intends to sell but before he does he is arrested for killing the couriers. Captain Renault, the Chief of Police, who is neutral in his political views, informs Rick that Victor Laszlo, the European Resistance leader, is in Casablanca and will do anything to get an exit visa but Renault has been "told" by Major Strasser of the Gestapo, to keep Laszlo in Casablanca. Laszlo goes to Rick's to meet Ugarte, because he was the one Ugarte was going to sell the letters to. But since Ugarte was arrested he has to find another way. Accompanying him is Ilsa Lund, who knew Rick when he was in Paris, and when they meet some of Rick's old wounds reopen. It is obvious that Rick's stone heart was because of her leaving him. And when they learn that Rick has the letters, he refuses to give them to him, because "he doesn't stick his neck out for anyone".
III. Conclusion: With the revelation, the lovers are reconciled. Rick agrees to help, leading her to believe that she will stay behind with him when Laszlo leaves. When Laszlo unexpectedly shows up, having narrowly escaped a police raid on a Resistance meeting, Rick has waiter Carl secretly take Ilsa back to the hotel while the two men talk. Laszlo reveals he is aware of Rick's love for Ilsa and tries to persuade him to use the letters to take her to safety. When the police arrest Laszlo on a minor, trumped-up charge, Rick convinces Renault to release him by promising to set him up for a much more serious crime: possession of the letters of transit. To allay Renault's suspicions, Rick explains he and Ilsa will be leaving for America. When Renault tries to arrest Laszlo as arranged, Rick forces him at gunpoint to assist in their escape. At the last moment, Rick makes Ilsa board the plane to Lisbon with her husband, telling her she would regret it if she stayed, "Maybe not today, maybe not tomorrow, but soon and for the rest of your life." Major Strasser, tipped off by Renault, drives up alone. Rick shoots him when he tries to intervene. When his men arrive, Renault pauses, then tells them to "Round up the usual suspects." Once they are alone, Renault suggests to Rick they join the Free French at Brazzaville. They walk off into the fog with one of the most memorable exit lines in movie history: "Louis, I think this is the beginning of a beautiful friendship."
Sources:
http://en.wikipedia.org/wiki/File:Casablanca,_title.JPG,
http://www.imdb.com/title/tt0034583/
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http://en.wikipedia.org/wiki/Casablanca_(film)#Lasting_impact
