Essentially, Fahrenheit (also called Indigo Prophecy in the USA) is an adventure game played in the third-person perspective. There are also some timed-action sections and fighting sections which use console-type "combos" to trigger set piece maneuvers. The game switches back and forth between the perspective of the three main participants, the hero, who is on the run, and two police officers. You get to experience the private lives of each character and the decisions you make will affect their mood. If their mood drops too low, they can't carry on and the game ends. Speaking of mood, there are one or two sex scenes that are quite graphic (in the European version), but everything is tastefully done ... if that helps. (Note the Teddy Prendergrass music "Love TKO") It didn't bother me but I'm in my 50s and have seen everything (heh- heh). By the way, the game has a "15" age rating in Europe.
Everything hinges around a murder, committed in a diner washroom by Lucas Kane (the hero). He appears to be in some kind of trance and has no control of his actions. After the killing, he regains control and must decide (through your input) what to do next: run in panic, or clean up the blood and hide the corpse. To stay one step ahead of the police, Lucas must try to discover what was behind the bizarre action that he was forced to undertake, and this forms the main plot of the game. It does get quite "supernatural," and some of the set sequences owe a lot to the "Matrix" movies.
You can get some extra lives during the game and pick up some bonus points that can be used to unlock some goodies such as concept art, movies, "outtakes" and some original soundtracks. The producer, David Cage, presents the tutorial in a digitized version of himself. Cage was responsible for Omikron: The Nomad Soul, another game which had character interaction and fight sequences. If you liked Omikron (also known as the Nomad Soul), you'll like this one. I know I certainly did.
The package I got was a DVD Style case with a single Game DVD and a short manual.