Episodes: Series - Siren - 2018

Bristol Cove, a coastal town that was once known as a home to mermaids, is turned upside down when a strange girl arrives.

A device making a weird sound is discovered by Ben and the North Star crew, while Ryn seeks shelter with the local folklore expert.

The investigations of Dale and the local police all point to Ryn, while Calvin and Xander's search for Chris continues.

Chris manages to run away when the military facility goes on high alert. However, he's not the only one.

Ben investigates some overfishing he finds suspicious while Decker doubles his effors to find the mermaid who ran away.

Maddie and Ben attend the latter's mother's fundraising gala when a surprising guest arrives and offers to end the overfishing.

Ryn is interrogated by the police while Ben and Xander go to the sea for answers and are met by an unwanted guest.

Bristol Cove is mourning a loss, and Ryn is consequently experiencing a novel human emotion.

Donna comes to shore along with two members of her colony, causing chaos throughout Bristol Cove.

The mesmerizing siren takes control of Ben and Decker, while Dale has to deal with the rising crime in Bristol Cove.