It’s remarkable to experience this film on a large screen again after so many years—without any special effects, just presented in 4K and HD—essentially as director Michael Curtiz would have seen it in 1942, and it truly is an excellent movie. Humphrey Bogart portrays "Rick Blaine," who operates his Casablanca café as a safe haven in the North African desert for those escaping Nazi control in Europe. The arrival of "Ilsa" (Ingrid Bergman) and her husband, Czech resistance fighter "Hector Lazlo" (Paul Henried), reveals a shared history between “Rick” and Ilsa. As "Maj. Strasser" (Conrad Veidt) and local police chief Claude Rains ("Capt. Renault") become entangled in this complicated web of lies and trickery, the situation slowly intensifies with a captivating and refined feel. Bogart and Bergman share an undeniable intensity; their connection is palpable—Bergman, as she often does, doesn’t need to act—simply being herself is enough. Rains delivers a strong performance as the scheming police officer, and Veidt handles the restrained but impactful dialogue flawlessly. As with many of the greatest films, its (apparently) seamless simplicity is what makes it work so well, enhanced by a beautiful musical score alongside skillfully directed, atmospheric cinematography and a very talented supporting cast including Peter Lorre and Sydney Greenstreet, who plays a wonderfully disreputable character. There were significant limitations and problems with the “studio system” of that era, but when successful, it could assemble an extraordinary group of people both in front of and behind the camera to produce enduring classics like this one.

Source on TMDB