On Course (1985)

In search of an unknown but intriguing treasure hidden somewhere in a sun-drenched island of the azure Aegean Sea, Kostas and two of his friends set off on a summer adventure in a graceful and swift ketch, to shed light on a well-hidden secret. Making little progress, the three companions will have to follow their hunch, half-baked leads, and unfounded rumours, stepping back more than three decades to trace the events which led to the death of Kostas' father during the Greek Civil War. However, who knows what lies buried in the isle's rugged soil? Could the tempting prize be arms, gold sovereigns or something far more important?