After the Kingsman's headquarters are destroyed and the world is held hostage, an allied spy organisation in the United States is discovered. These two elite secret organisations must band together to defeat a common enemy.

Lisbeth is recovering in a hospital and awaiting trial for three murders when she is released. Mikael must prove her innocence, but Lisbeth must be willing to share the details of her sordid experiences with the court.

As computer hacker Lisbeth and journalist Mikael investigate a sex-trafficking ring, Lisbeth is accused of three murders, causing her to go on the run while Mikael works to clear her name.

A journalist is aided by a young female hacker in his search for the killer of a woman who has been dead for forty years.