Siren

A girl arrives in a town with a legend of mermaids.

Ben discovers a device that could lead to Chris.

Xander and Calvin's search for Chris heats up.

Chris escapes along with a traumatized "nurse."

Decker ramps up efforts to find his escaped mermaid.

Donna and Ryn clash over their feelings about humans.

Ben and Xander abscond with the North Star to catch their own mermaid but things don't go as planned.

Bristol Cove mourns a loss.

Donna's "companions" have different plans than she does.

Xander's past drives a wedge between him and Calvin.