A huge train accident in an idyllic small town shocks the whole of Finland, and accident investigator Marita Kaila is faced with the most difficult case of her career. Under increasing pressure, Marita and her team try to find out what led to the death of dozens of people. But there is also a tragedy in Marita's own past, which the demanding investigation brings to the fore. Will he solve the case before the pressure becomes too much?
E1
The peace of a small town is shattered when a passenger train and a station building are destroyed in a huge explosion and fire. Accident investigator Marita Kaila is facing the most difficult case of her career.
E2
Eyewitnesses to the accident are vital to investigators - but whose word can you trust? Marita has to make difficult choices when both the relatives of the victims and the government demand an explanation.
E3
Rumors about the cause of the fire inflame the small-town residents. The pressure towards the investigation increases when the track is to be opened to traffic. Marita's carefully guarded secret threatens to come to light.
E4
The trains' new control system is praised as reliable, but the evidence does not convince Marita. Marita gets a reason to doubt the impartiality of her own team as well.
E5
As new evidence is revealed, the tensions between the researchers also increase. Shocking information makes Marita question her own principles.
E6
Marita doesn't think the police have arrested the right person - but can she trust her own judgement? The researchers face a threat from an unexpected source. Does the accident claim more victims?