Splinter Cell: Double Agent takes the stealth-based series in a new direction after three successful covert operations on multiple platforms. After learning his teenage daughter was killed in a car crash, a despondent Sam Fisher is unable to complete his duties for the NSA's splinter cell, Third Echelon, and is reassigned as a NOC, a non-official cover agent who operates from within dangerous organizations. His mission is to infiltrate a domestic terrorist group called the John Brown's Army. For the first time in the series, Fisher cannot rely solely on his gadgets or the direct support of the NSA. He must instead fall back on his keen instincts to survive while working deep undercover.Instead of advancing through linear missions across a series of international locales, players will experience a branching storyline with multiple endings, where decisions made at one juncture will influence subsequent events as the game progresses. Fisher must initially earn the trust of the John Brown's Army to become a card-carrying member, so he must engage in carefully orchestrated heists and even an elaborate prison break to get in the good graces of key contact Jamie Washington. If Fisher is successful in befriending Washington, he will be invited to the terrorist group's headquarters, a multi-floor structure that serves as a jumping point for future missions.From that point on, Fisher will be faced with multiple moral decisions as he walks a fine line between working with the JBA and on behalf of his NSA mentor, Irving Lambert. He will also be partnered with an AI-controlled character in many of the missions, introducing a new element to the single-player game. Of course, Splinter Cell: Double Agent also features online support, including cooperative and competitive play, along with an exclusive online character called the spy girl. The PS3 version features larger environments, interactive cut-scenes, more onscreen characters, alternate missions, and enhanced graphics when compared to the Xbox and playstation 2 games.