The military spy on Ben, Maddie, and Ryn, while the mermaid struggles once mating season begins.
Jack invites the military into the Parsonage, where he allows his personal life to be seen with clear eyes.
Susan and the Magus are getting too close, which pushes Jack further to the edge.
Ryn takes Ben and Maddie to a secret place below the ocean. Levi returns to land.
Nicole helps Ben and Maddie research the siren song appropriately. Other discoveries come to light.
Ernest is haunted by the recent past. Susan and the Grand Magus get much closer.
Jonas returns to 2020 to save everyone. Things go terribly wrong. Or, do they?