The Sea Nymph (Sweden)

This is a tale from the following public domain volume,gently retold by Janice Del Negro and available to any storytellerfor the telling: Herman Hofberg, Swedish Fairy Tales, translated by W. H. Myers. Chicago:Belford-Clarke Company, 1890.

Some night, one night, maybe this night, four fishermen sheltered in a hut by a fishing village on the shore of an island. After a long day fishing they went to bed, but while they were just falling into sleep’s warm waters they heard the door creak open. In the glistening moonlight they saw a white, dew-besprinkled woman's hand reaching in through the door. They knew, all of them, that their visitor was a sea nymph who sought their ruin. Not one man moved, but held their eyes closed and their prayers close. When the hand did not find what it wanted it withdrew, and at the close of the door the closest man threw the bolt. 
The following day one man went home and another arrived- Kinnar Lummelund, young, brash and newly married. He made fun of the fishermen’s encounter of the night before, and, completely forgetting his recent marriage vows, boasted that if he had been there he would not have hesitated to grasp the proffered hand of a beautiful woman. He gave no credence to nymphs- old wives tales, that.
That night while the fishermen waited for sleep, the door opened in the moonlight and a dew-bespeckled arm, with a most beautiful hand, reached in over the sleepers. Young Kinnar rose from his bed, approached the door and seized the outstretched hand. He regretted his boast, and ruefully recalled the vows he wished he had remembered. The glowing hand wrapped around his with a clammy intimacy, and drew him noiselessly out the door, which closed softly after him. After a frozen moment, the men leapt for the door, seeking their comrade, but there was nothing on the moonlit beach but moonlight. Morning came and Kinnar did not appear. Far and near they searched, but his disappearance was complete.
Three years passed and nothing had been heard of the missing man. Kinnar’s young wife mourned him all this time as drowned and dead, but one day laughed at a good man’s smile and was persuaded to marry. The wedding day was filled with joy, food, and music, and at the height of the dancing a stranger entered the cottage. With each step the stranger took, voice by voice, the celebration fell still, as guests and bride recognized the missing Kinnar Lummelund. Surprise and consternation followed.
Pressed as to where he had been, Kinnar related that the sea nymph had dragged him down into the sea. In her pearly halls he forgot his wife, parents, and all that was he loved by him until the morning of that day, when the sea nymph said, "She that mourned you will be mourn no longer."
Kinnar’s senses had returned with a shock and he asked, "Is it my wife? Is she to wed?" The sea nymph said it was, and at his urgent request, she allowed him to leave the sea to see his wife. The nymph warned that when he arrived at the wedding he should under no circumstances enter, but when Kinnar saw his once-beloved adorned with garland and crown he could not resist, and the warning was nothing but an echo in a shell.
As Kinnar told his story the wind rose, sweeping the celebration door open. The sea turned grey and a tempest rose, rain and hail beating on the roof. It seemed the marriage would end before it began. Kinnar ran to the door, and desperately called on the sea nymph, but the wind first took his voice and then took him.
https://sites.pitt.edu/~dash/abduct.html#agedbride