While Jens Møller comes in for the morning briefing, an investigator reports on a strange case. A homemade submarine carrying a female Swedish journalist and the submarine's inventor has gone missing.

The journalist's parents are assisting the police, and forensics are working hard to find important clues in the capsized submarine - without any luck. Then the case suddenly takes a dramatic turn.

While the forensic team works, Jens Møller and his team of investigators are waiting for answers. Have they found conclusive evidence that the Swedish journalist is dead.

Jens gets assistance with the search. Swedish cadaver dogs that can locate bodies below sea level are brought in. Although the dogs mark the areas quite accurately, the divers don't find anything.

The case is slowly coming together, but Jens Møller and his team still have no conclusive evidence. Jens calls a press conference in the hope of encouraging the accused to talk.

Jepsen makes it clear to Jens that they need more firm evidence. Maibritt refuses to drop the case, and after nearly six months of hard work she finds the key that might dispel any doubt about the guilt of the accused.