Best friends Bětka and Alma are spending a dull summer at a lakeside with Bětka’ s older sister Marie. The teenage girls want to experience something big but their efforts fail until they discover a mysterious pool on an island.
After their deceased grandmother leaves them both her isolated seaside mansion, two feuding families start a turf war over it. However, when her secret lover enters the picture, they decide to put their differences aside to get rid of him.
