A corpse is discovered in Wilhelmshaven Bay, identified as an officer of the Dutch KFOR troops in Kosovo. Detective Holzer delves into the investigation and encounters Michael Kühnert, a sailing instructor, and his deaf wife, Elena. The couple's unique way of communicating through sign language, including with their daughter Sabin, piques Holzer's interest. As the investigation unfolds, Holzer is drawn into their world, exploring the dynamics and secrets that lie beneath their seemingly ordinary lives, unraveling a web of intrigue that pulls him further into the mystery of the officer's death.