Siren

Ben tries to cope with the after-effects of his encounter with the siren song. Maddie tries to reconnect with her daughter.

Ben, Maddie, and Ryn try desperately to keep the newly arrived mermaid pack hidden from the rest of the town; Elaine becomes more suspicious of Helen and her connections to the family.

Ryn's loyalties are brought into question and she must fight to stay in control of the pack; Ben interferes with a mermaid ritual; Helen learns more about her family lineage.

Ryn attempts to find new housing for the mermaids; Ben mentors Levi as he learns how men behave on land; Maddie continues to struggle with her mother's renewed presence in her life.

Ryn is faced with some pushback as she attempts to teach the other mermaids how to be more human in order to better adapt; Maddie is put in a dangerous situation while attempting to help her mum.

Dale deals with the fallout of Maddie and Ryan's encounter with Susan's past; Katrina continues her attempts to persuade the rest of the mermaid pack.