At the beginning a young girl Eglė after bathing with her three sisters discovers a serpent in her clothes. Speaking in a human voice, the serpent agrees to go away only after Eglė pledges herself to him in exchange for his leaving the clothes, not realising the possible consequences
Three days passed, thousands of serpents come for the bride, but are tricked by her relatives three times in a row. A goose, a sheep and a cow are given instead but the cuckoo warns about the deceit every time. Enraged serpents return the final time and take Eglė with them to the bottom of the sea to their master.
Instead of seeing a serpent, Eglė meets her bridegroom Žilvinas, a handsome human, the Serpent Prince.
They live together happily and bear for children, until Eglė decides to visit home and her husband denies it.
IN ORDER TO BE ALLOWEDTO VISIT HOME, EGLĖ IS REQUIRED TO FULFIL THREE IMPOSSIBLE TASKS: TO SPIN A NEVER –ENDING TUFT OF SILK , WEAR DOWN A PAIR OF IRON SHOES AND TO BAKE A PIE WITH NO UTENSILS.
AFTER SHE GETS ADVICE FROM THE SORCERESS AND SUCCEEDS, EGLĖ AND THE CHILDREN ARE RELUCTANTLY LET GO BY ŽILVINAS
AFTER MEETING THE LONG LOST FAMILY MEMBERS, EGLĖS BROTHERS TO TELL THE SECRET CALLING OF THEIR FATHER. THE BOYS THREATENED AND BEATEN BY THEIR UNCLES, HOWEVER THEY REMAIN SILENT AND DO NOT BETRAY THEIR FATHER.
AFTER MEETING THE LONG LOST FAMILY MEMBERS, EGLĖS BROTHERS TO TELL THE SECRET CALLING OF THEIR FATHER. THE BOYS THREATENED AND BEATEN BY THEIR UNCLES, HOWEVER THEY REMAIN SILENT AND DO NOT BETRAY THEIR FATHER.
WORRIED EGLĖ CALLS HER HUSBAND, BUT UNFORTYNATELY ONLY FOAMS OF BLOOD RETURN FROM THE SEA.
WHEN EGLĖ DISCOVERS THAT HER BELOVED IS DEAD, AS A PUNSHMENT FOR BETRAYAL SHE TURNS HER CHILDREN AND HERSELF INTO TREES. THE SONS WERE TURNED INTO STRONGTREES, AN OAK, ASH AND BIRCH, WHEREAS THE DAUGHTER WAS TURNED INTO A COMMON ASPEN. FINALLY, EGLĖ TRANSFORMED HERSELF INTO A SPRUCE.
