The Cologne native Ina is on vacation with her family at the North Sea. On the way back from the beach, her past catches up with her. She is sure that she has recognized the murderer of her sister, who was killed twenty years ago. Commissioner Krumme and his young colleague Pat from the Husum criminal police begin their investigation and soon discover who Ina saw: Pastor Jonas Hartung, a highly respected and popular man, a pillar of the community. Krumme does what he does best - he trusts his gut feeling rather than the evidence. Yet, he too has no idea of the deep abysses this case will lead him to...