Small, dark and intense, Simon grows up aware that there is something different about him, something that causes late-night quarrels and sometimes tears. With the rise of Hitler in Germany and the coming of was to Sweden's neighbours, the tensions increase. Befriending a young Jew, Isak, who is quickly taken under his mother's wing, enriches Simon's life, but makes it more difficult too - for Isak seems to fit in much better at home that Simon does himself.
With the war's end comes the day when Simon must be told the reason for his affinity for the lake and its surrounding oak trees; for the strange dreams of an old man beneath the waves; for his dark good looks and uncanny musical ability.