Una su 13 is a captivating film that harmoniously merges the thrill of traditional mystery and suspense, with a sprinkling of romantic comedy. The film is an Italian comedy-drama directed by Nicolas Gessner and Luciano Lucignani and released in 1969. The dynamic cast, led by the talented Vittorio Gassman and the stunning Sharon Tate, make it an engaging tale that captivates the viewer with an intriguing mixture of tension, charm, and wit.

Vittorio Gassman, one of Italy's most respected actors, plays Jean, a charming, sophisticated, and world-weary man with a flair for automobiles. Gassman showcases his versatility as an actor, offering a performance that is at times comedic, at times dark, and always captivating.

Sharon Tate, the American actress and model, delivers a powerful yet endearing performance as Pat, a woman eagle-eyed, intelligent, and a mystery lover who leaves her domestic sphere to solve an intricate puzzle that our protagonist Jean presents. This was one of the last films Sharon completed before her tragic death, further amplifying its gravity amidst her oeuvre.

The movie embarks on its journey with Jean, awakened abruptly from his seaside vacation by a strange, hair-raising dream. This nightmare, about his Mercedes vehicle crashing into a tree and bursting into flames, leaves him shaken and eyes wide open questioning its implications. The dreams repeat, perpetuating Jean's belief that it's an ominous premonition of a devastating event bound to take place sooner or later.

Out of fear and a hint of superstition, Jean decides to put his troubling premonition to the test. He devises an elaborate plot wherein he asks his eleven acquaintances to drive his car, believing one of them might meet the fatal destiny portrayed in his dream. These friends, lovingly referred to as his "guinea pigs," are initially unaware of the eccentric and potentially dangerous experiment they have been lured into.

Among the acquaintances is Sharon Tate's character, Pat, whose initial ignorance about the daunting experiment eventually segues into intrigue and determination to unravel the truth. As the plot deepens, her growing affinity towards Jean also starts playing a vital role in the movie, lending an additional layer to their complex relationship. The viewer is gracefully carried along this journey of suspense, intrigue and underlying romance, glued to the edge of their seat, as they question who will meet this prophesied fate in the driving seat.

The setting and cinematography of Una su 13 contribute significantly to its charm. The Mediterranean landscape, underscored by the vivid use of colors, lends an appealing, vibrant backdrop for the story. The slow-motion scenes of the car crash are dramatically recreated with a sense of horror and fascination. It's also noteworthy how the directors regularly lay emphasis on the Mercedes car, tacitly making it one of the key characters dictating the events of the narrative.

The diversified and engrossing relationships among Jean, Pat, and the eleven friends form the core of the movie, aiding in the creation of both light-hearted moments and gripping striking tensions. The script comes laced with subtle humor and wit, making the intimidating concept of premonitions and death more palatable.

Una su 13 is a well-crafted movie that excellently infuses heady suspense with elements of dramatic comedy. A fantastic blend of clever direction, memorable performances, and a gripping narrative hooks viewers from the start. For those intrigued by unpredictable plots tied with evoking performances, this movie is a must-watch. Remember, it's a ride imbued with suspense, charm and a peculiar sense of mystery; you'd be hard-pressed to predict the climax or the journey there.