Well it hasn't finished yet on Sky One but it's getting kinda predictable: as soon as Jack gets any sort of mini-victory, somehow he's forced by the enemy to switch sides (kidnap daughter, threaten to kill his wife etc). So he betrays CTU/FBI under their nose, they go on an all-out manhunt, he evades by somehow finding someone (gullible) on the inside to help. Finally they catch up to him by which time he's done whatever he had to do and now convinces them it was really for the greater good. Jack's a hero again. But wait, he's about to get another phone call phone call... rinse repeat.