Hitman: Codename 47 - gamefront.com

As the enigmatic Hitman, you must use stealth and tactical problem solving to enter, execute and exit your assignment with minimum attention and maximum effectiveness. For a price, you have access to the most devious devices, but how you use them will determine if you retire as a millionaire or get permanently retired.
The Hitman is the world’s most accomplished and wealthy assassin; however, he is plagued by a troubling past of deception and genetic butchery. The ingenious story will evolve over five chapters of heart-stopping action. Remember, the world of contract hits rewards a quick intellect more than a quick trigger finger.