Conviction opens up at what seems to be the rock-bottom moment of Sam Fisher's life. He's on the run from the law after the events of the last Splinter Cell game, which is bad enough. What really pushes him over the edge is that someone murdered his daughter, making the death look like a simple hit-and-run by a drunk driver. Naturally, Sam isn't going to let this stand, and with nothing left to lose but his life, he sets off on a one-man rampage to kill everyone involved in his daughter's murder.
