Widowed doctor Liz Rodriguez hopes the move to World's End, Maine will help heal her fractured family. Her daughter Emily is doing well enough but fifteen-year-old Zach has become secretive and sullen. The townsfolk are friendly and things seem to be going as smoothly as can be expected until a mysterious man from a brief indiscretion in Europe years ago takes too keen an interest in her-- and in her son.

When Morgan of the finfolk follows the sea lord to the United States, he wishes only to swiftly return them to Sanctuary before more merfolk are lost. His plan changes when he sees the boy. His suspicions are confirmed when he catchessight of Liz, older but just as lovely; and the memory of their encounter comes crashing in. Now as his people are dying he finds hope in the existence of Zach, his unknown child.

Morgan knows little of love, being focused on defending his dying people despite his belief it is a futile battle. Liz acknowledges his right to meet his son, but is reluctant to allow her children to become attached to him so soon after losing their father. Then she learns the secret Zach has been hiding, and realizes Morgan is the only one who can keep him safe from the enemies of the children of the sea. But who will safeguard her heart if she loses both Morgan and her son to their watery world?

IMMORTAL SEA is book 4 in the Children of the Sea series. Virginia Kantra has given us another gem. Watching Morgan learn his heart and come to care for Liz and her family is a magic beyond the paranormal themes of the book. Kantra is adept at revealing Zach's struggles with his newly discovered nature and his feelings of isolation and hopelessness while trying to fit in to the new community at World's End.