Bristol Cove is a coastal town known for its legend of once being home to mermaids. When the arrival of a mysterious girl proves this to be true, the battle between man and sea takes a vicious turn.
Dale and the local police's investigation starts pointing directly at Ryn. Xander and Calvin's search for Chris heats up when they find Donna, the nurse who works at the military bunker.
Old friends return to Bristol Cove. Ben investigates some suspicious overfishing. Decker ramps up his efforts to find his escaped mermaid and shows the true extent of his influence.
Donna returns but her "companions" have different plans than she does. Ben, Maddie and Dale work together to try and stop Bristol Cove's newest threats.
The enchanting siren song takes hold of Ben and Decker while Dale must answer for the escalating crime in Bristol Cove. Xander's past transgressions drive a wedge between him and Calvin.
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Siren takes us inside Bristol Cove -- a coastal town known for its legend of once being home to mermaids. When the arrival of a mysterious girl proves this folklore all too true, the battle between man and sea takes a very vicious turn as these predatory beings return to reclaim their right to the ocean.