Gamaeki writes: "After the series high point, with Chaos Theory, Ubisoft thought it wise to start changing up the formula that was Splinter Cell by introducing a more grittier take on Sam Fisher in Double Agent. While the game had it’s flaws, it was a welcome change of game dynamics for the series as a whole. It introduced a branching story canon that was later answered in the less then stellar PSP title Splinter Cell Essentials. In the wake of Double Agent, Sam Fisher had to do unspeakable things in the name of National Security, the most heinous being forced to kill his handler at Third Echelon, Colonel Irving Lambert. After the mission Sam went into hiding from Third Echelon, left with the memory of his dead daughter, and the reminder of the sacrifice he made to maintain cover."