Seventeen-year-old Serena is the youngest member of a dying race. The increasing acidity of the ocean is destroying her home, slowly eating away at the once thriving underwater landscape. But since the night of Serena's birth, it is an outside force that most threatens their dwindling population. Werewolves, who once served as protectors for mermaids in the Kingdom of the Undine, now seek to eliminate all who dwell in the ocean—and Serena is about to find herself right in the middle of the deadly conflict.

Given the title of Werewolf Liaison, Serena is determined to make things right for her people. When she ventures to The Dry, she meets Liam, the werewolf with hazel eyes, and her whole world gets turned upside down. As Serena discovers the real history between werewolves and mermaids, she is left wondering who her true enemies are.