Anna is a quiet, slightly timid woman of thirty. She lives with her family in the suburbs of a major city. Anna and her husband Sebastiaan have a calm and steady relationship. Before they got married he was her older sister's lover. Now all three seem good friends. Anna is an irrigation specialist who often travels to developing countries. During one of her visits abroad, a female colleague commits suicide. The woman has hung herself. Anna finds her. Even though Anna wasn't close to the woman, her death makes a big impact on her. No one seems to know why she has killed herself. For the first time, Anna realizes that you can remain unknown even to those you have most dear. When the dead woman's husband very quickly finds a new wife, Anna's image is confirmed. It is as if the dead woman never existed. At home, Anna doesn't tell anyone about the incident with the dead woman. Instead, she begins to observe her husband and her family and asks herself what she means to them. Guernsey is the story of a woman who suddenly looks at her own life and wonders how she became miles apart from the people she is closest to.