It is the start of the holiday. Anna, Georg and their young son Georgie travel to their idyllic lakeside house. Their neighbours, Fred and Eva, are already there. They have arranged to play golf together the next day. The weather is superb. While father and son are rigging up their freshly overhauled sailing boat, Anna prepares supper. Suddenly Peter, a young, evidently well-bred guest of their neighbours, is standing at the front door asking Anna for a few eggs, explaining that Eva has started cooking and run out of eggs. Anna willingly complies with the request. Then stopping abruptly she asks how he has entered their property. Peter replies that there is a hole in the fence which Fred had shown him …