Chuck faces an unusual task, when Sarah's hot colleague from the CIA shows up requesting help for a mission. Morgan tries to get Chuck to set him up with Sarah's new friend. When Chuck finds out that a million dollar diamond hidden in a Malibu mansion is being used to help fund terrorists, he must help these two beautiful women steal it back. Chuck is finding out that Sarah's job of living a double life, which she is all too good at, is really preventing him from getting to know who she really is.