A successful businesswoman, Yvonne Gerstrand, developed an unusual hobby: in the evenings she would leave for the suburbs and stroll along the streets between the cottages, peeking into people’s windows. Soon she knew a lot about every family in the settlement, and only the life of the residents of house number 9 on Orchid Street remained a mystery to Yvonne. Accidentally noticing an advertisement that the owner of this house, Bernhard Ekberg, needed a household assistant, Yvonne—quite unexpectedly for herself—called and, introducing herself as Nora Bric, offered her services. Twice a week Yvonne visited the Ekberg home, gradually becoming more and more involved in the life of its master, until she discovered a terrible secret about his family…