Barents Sea, August 12th, 2000. During a Russian naval exercise, and after suffering a serious accident, the K-141 Kursk submarine sinks with 118 crew members on board. While the few sailors who are still alive barely manage to survive, their families push for accurate information and a British officer struggles to obtain from the Russian government a permit to attempt a rescue before it is late. But general incompetence are against all their efforts.

The discovery of a chopped-off hand in a Brussels canal forces Belgian police diver Kiki to face deep guilt from the past, her own and her country’s. Based on the book ‘Ritual’ by Mo Hayder.