The forbidden sea - Shiela A Nielsen

When Adrianne comes face-to-face with the mermaid of Windwaithe Island,
she is convinced that the mermaid means her harm. After all,
the island is steeped in stories of mermaids' curses and the ill-luck
that they bring. But Adrianne is fierce-willed and courageous
and is determined to protect her family and the islanders from
danger.
Yet when the islanders find out about Adrianne's encounters with
the mermaid, her family is scorned. They believe that once active,
the mermaid cannot be quieted until an islander sacrifices herself
to the sea.
But is the legend true? And will their fear make them force Adrienne
to test it?
A haunting story of love, surrender and strength.