Two young girls brutally murder a taxi driver. The older one manages to escape from the investigative prison, and soon her charred corpse is found at a transformer substation. Meanwhile, unknown people steal from the morgue the body of a man who died of a heart attack, leaving in its place an electromagnetic relay from the very substation where the girl was found. Commissioner Kurt Wallander believes there is a link between the taxi driver's murder and the death of Thinnes Falk, an information technology consultant. With the help of a young hacker just released from prison, the commissioner confronts the omnipresent and invisible enemy threatening the financial centers of the planet.