US president Helen Tyler is on a state visit to Sweden and, although accompanied by both FBI and her own security service, it's Swedish police who will be in charge of ensuring her safety while in Stockholm.

The police throw all their resources into the search for the missing US president, who disappeared in Stockholm on their watch.

Inger Johanne steels herself to work with Warren Schifford. As the search for the missing president leads to the dead body of a presidential guard, rumours emerge of possible infighting between the FBI and the Secret Service.

Ingvar suggests he and Inger Johanne team up to track down the mole inside the Swedish police force, but he does a good job of undermining their teamwork and relationship

Swedish police search for a mole within their own ranks, while Inger Johanne leaves Ingvar behind and goes looking for the US president on her own.

Inger Johanne wants to get help to the captive president but is surprised to discover the president doesn't trust anyone in her own ranks.

Someone is tracking the signal from the missing US president's mobile phone. Meanwhile, both the president and Inger Johanne are haunted by ghosts from their past.

A hitman is after the missing US president, who remains in hiding with Inger Johanne and Hedvig.