"Thin Ice" tells of the consequences of climate change and the Arctic Council's quest to advance a nature conservation treaty to ban oil drilling in the Arctic. Negotiator Elsa Engstrøm wants to make the meeting a success, but the interests of the individual parties are far apart. In the middle of the negotiations, a research vessel suddenly disappears. On board was Viktor, a representative of the Swedish delegation and Elsa's colleague. Coincidence or terror? While the poker game for the contract goes into the next round, help from Sweden approaches: Viktor's intrepid wife, the policewoman Liv, takes over the investigation. Then more strange incidents occur that threaten to derail the negotiations.