Summer 1910. Several tourists have vanished while relaxing on the beautiful beaches of the Channel Coast, near Slack Bay. There lives a small community of fishermen and other oyster farmers, including a curious family, the Bréfort, led by “The Eternal”, a father ruling as well as he can on his prankster bunch of sons, especially the impetuous Ma Loute. Towering high above the bay stands the Van Peteghems’ mansion. Every summer, this bourgeois family stagnates in the villa, not without mingling with the ordinary local people. Over the course of five days, as starts a peculiar love story between Ma Loute and the mischievous Billie Van Peteghem, confusion and mystification will descend on both families, shaking their way of life.