Ryn must undergo a difficult process to ensure the survival of her species
Ben must put aside his jealousy in order for Ryn to mate.
Nicole helps Ben and Maddie research the siren song appropriately. Other discoveries come to light.
Ryn returns to Ben and Maddie. The thrupple must learn to trust an outsider.
After Sean's body washes up in a fishing net, things get sketchy for Ben, Sheriff Bishop, and Xander.
Ben's struggling with Ryn's siren song, as she also struggles to hold onto power amongst her people.
Ben struggles with the siren's song. Xander finds out about the merpeople on land.
More of Ryn's people come to the shores. But something's forcing them there.
Helen reveals more of her history. Bristol Cove deals with the aftermath of a merfolk attack.
Ben goes out to sea, trying to thwart the military. But there's worse trouble than the government on the water.
Decker shows up in Bristol Cove, which causes all sorts of damage.
Ben tries to help Ryn, but the mermaid is only concerned with finding her sister again.