When a retired United States Senator's passion for deep-sea treasure hunting off the coast of Palm Beach leads to murder, Jake Sullivan, chief prosecutor for the Justice Department in Miami, thinks he has an open and shut case: the DNA of the man pulled out of the warm waters near the ill-fated yacht matches blood found on the deck.

But life is never so simple for Jake. In a rush of political maneuvering, Jake's suspect is whisked away by the State Department under a claim of diplomatic immunity. The mystery man is no simple treasure thief; he is a covert operator for the Mossad, Israel's elite intelligence agency. But Jake and his investigator, Mike Lang, are no less committed to solving the murders of Senator Daniel Simmons and his wife.

Their instincts are piqued when information leads them to the writings of an ancient Hebrew mystic and the lore behind an iconic relic of Medieval Spain lost in 1715 when a hurricane wrecked a Spanish treasure fleet off the Florida coast. But those findings are less bizarre than their uncovering of an Israeli army faction intent on realizing a dream of a "Greater Israel".

Discovering the identity of the mysterious leader of "The Group of 40" becomes more than a quest to solve a murder investigation. Jake and Mike hope to prevent South Florida from becoming a war zone, and the fuse that could light the powder keg that is the Middle East.