Captain Giakoumis makes the big decision to forsake the sea and live peacefully close to his wife and his adopted son, Andreas, who is about to sit for examinations in order to become a lieutenant. However, a terrible secret burdens his soul. He has a daughter, Agni, whom he had years ago when he had an affair with Maria, a prostitute from Troumpa. Maria, before she died, expressed the wish that Giakoumis recognize their daughter as his child. He, however, refused, since Agni ended up becoming a prostitute. The girl, to take revenge on her father, starts an affair with her half-brother with the intention of dragging him down into the mud. In the end, however, she falls in love with him, and this love blesses everyone and everything.

Η Αγνή, μια πόρνη του λιμανιού, θέλοντας να εκδικηθεί τον πατέρα της που έχει παρατήσει τη μάνα της ανύπαντρη πριν γεννηθεί, τα φτιάχνει με το θετό γιο του και προσπαθεί να τον καταστρέψει, με αποτέλεσμα ο νεαρός να πάει φυλακή...