Hipermestra is one of the 50 daughters of King Danao of Argos, whose twin brother, King Egitto, has 50 sons. Danao lives in fear of a prophecy that his life and kingdom will be taken by the lover of one of his daughters. So he commands all his daughters to marry and then kill all the sons of Egitto. 49 daughters obey, but Hipermestra refuses to slay her husband, Linceo. Despite the trials and dangers that ensue, courage, love and loyalty triumph.