In the swimming pool of a luxury hotel in Sylt, the body of a successful German entrepreneur is discovered. The local police initially suspect an accident. However, when a team from the Federal Criminal Police Office arrives, it becomes clear that this is not a routine case. Then, during a severe November storm, a dead Russian combat diver is washed ashore. It is not long before the Navy intercepts an encrypted radio message from the area of German territorial waters, triggering a political nightmare: a Russian submarine is grounded off the coast of Sylt, and no one knows why. A nerve-wracking situation ensues. The phone lines between Washington, Berlin, and London are buzzing. What began as a local criminal case threatens to escalate into an international crisis. The author, Werner Sonne, worked as a television correspondent for ARD both domestically and internationally for over 40 years.