Nadia tells a 200 year-old story of mysticism, fear and mermaids. Emma and John uncover the terrifying truth hidden under the peaceful facade of Merrow's Cove.
Alice's past is revealed. Emma and John's investigation attracts the attention of Boston Police, bringing tensions in town to a breaking point.
A big break in the case sheds light on the life of Alice Crocker before Merrow's Cove. Emma and John make a risky decision with potentially fatal consequences.