It's the end of the seventeenth century. Alix is a middle-class French girl, due to marry a nobleman. Vivien is a rebellious 'poor' girl from Delaware. Both have been dealt a bad hand in life. When unexpected events steer them away from the destiny chosen from them, their paths cross when they are swept away to join the crew of a pirate ship named for its figurehead, a Mermaid preparing for war with a sword in one hand and a knife in the other.

Finding themselves in the middle of a quest for vengeance, can Alix and Vivien ever find peace?

Together they will discover adventure, love and pain. Together they will discover their inner strength. Together, they will become Mermaids.