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?

Jane, a structured travel agent in Helsinki, lives a comfortable life with her longtime boyfriend Mikki, a struggling actor. When Mikki proposes opening their relationship to reignite lost passion, Jane reluctantly agrees to attend a sex-positive retreat. There, she meets Valma, a confident, free-spirited woman deeply rooted in the polyamorous lifestyle. Drawn to Valma’s openness and emotional clarity, Jane begins to question the limits she’s placed on love and connection. As their bond deepens, Jane finds herself navigating unfamiliar territory—desire, jealousy, and self-discovery—while her once-stable life begins to unravel. What began as an experiment in freedom becomes a profound turning point that challenges everything Jane thought she knew about relationships.