The talented scientist Salvatore saved the life of young Ikhtiandr by transplanting him the gills of a young shark. Now the young man can live both on land and underwater. But the unique power has brought him deep loneliness. He feels unnecessary both in the sea and on land. Ikhtiandr is striving to accept his true nature, but he faces the cruelty of people who consider him a sea devil. Will he find his place in a world where no one understands him?