Fans of the original won't be disappointed, as there are more than enough shock moments in the first few hours to hint at the climactic build-up to come, while newcomers can quickly get involved in the lives of Jack and his family. There are some new characters to bolster the veteran cast and, interestingly (although not surprisingly given the outcome of the first series), Jack's character has taken an altogether darker, more psychopathic turn. The danger the characters find themselves in also has a much more global impetus, grounded as it is in the war against terrorism. Although the territory is more familiar this time around, this second series is just as much a high-tension, taut, adrenaline-fuelled ride as the first series, and one that will have you glued to your TV for the next 24 hours. --Kristen Bowditch