"Hitman is a stealth game series developed by the Danish company IO Interactive, now a division of Square Enix. The series is available on PC as well as several video game consoles, including the Nintendo GameCube, PlayStation 2, Xbox, and Xbox 360. The game series has since expanded into a novel, Hitman: Enemy Within written by William C. Dietz, and a Hitman film adaptation which is loosely based on the storyline of the games. Released on November 21, 2007, it starred Timothy Olyphant in the role of Agent 47.
The series revolves around Agent 47 (usually simply referred to as "47" or "Mr. 47"), an assassin-for-hire, whose flawless record places him in high demand among the wealthy and elite. The games feature a mix of orchestral and electronica musical scores, composed by Jesper Kyd."
Source: Wikipedia, "Hitman_(series)", available under the CC-BY-SA License.