When a former mermaid turns up dead, Eleri and Donovan are stuck with a case they never wanted, but can't shake...
Eleri—a former mermaid herself—should have been recused from the case. That's her friend on the autopsy table and putting her in charge of the investigation violates more rules than she can count. But her Special Agent in Charge won't let her off the case, making her wonder if there's more to Westerfield's demands than meets the eye.
He won't let Donovan out of the case either. The mysterious package from a brother Donovan didn't know he had contains as much threat as it does information. The lobomau are more organized and further-reaching than anyone thought, and Donovan now has a personal connection.
The team is stuck on a research vessel with a killer hot on their trail... but Eleri's skills are glitchy at best, and Donovan can't swim. Can they keep the remaining crew members—and themselves—alive or...