The Lightman Group are called in when Washington DC comes under terrorist threat. With national security at stake, Cal and co need to be on their A-game.
The murder of a marine captain in Baghdad leads to a murky property deal back in the US. As the investigation progresses, it emerges that intel analyst Nikki Jardine has another reason to want to visit Iraq.
The International Response Team suspects an American girl is in danger after being tricked by someone posing as her boyfriend and asking her to meet him in Turkey.
A limo driver's infatuation with one of his riders leads him down a dark path.
Locke, Sayid and Kate investigate a strange structure and its mysterious inhabitant. Meanwhile, Sawyer competes in a ping-pong competition to get back his belongings.