Plum Island - Nelson DeMille

NYPD homicide detective John Corey has moved into Long Island, restlessly recuperating from wounds received in the line of duty when he's hired to consult on the double murder of Tom and Judy Gordon, biologists who worked on Plum Island, the site of animal disease research for the Department of Agriculture.
Were the Gordons murdered because they'd stolen some valuable new vaccine, or even a dreaded virus?
They'd obviously outspent their income.
Had they been running drugs?
Corey doesn't think so, although and ice-chest missing from their boat points to something forbidden.
He teams up with Beth Penrose, a detective working her first homicide, and their visit to Plum Island reveals only that the FBI and CIA have sanitized the place.
Then Corey meets Emma Whitestone, an expert on Captain Kidd's lost treasure which is thought to be buried nearby...PLUM ISLAND is a thrilling novel from an author of consummate page-turning skill.