An Island of Light

MURDER AT TRIESTE CITY!
The problem isn't hiding the body and cleaning the blood — that part's easy. The real problem is the identity of the Admiral's killer: Meg McClusky, Truman "Mac" McClusky's twin sister. She stabbed USSF Admiral Taurus T. Benning in the chest and neck, murdering the man who killed their father all those years ago.
Soon the USSF sends a tenacious investigator to the underwater city of Trieste, and what started as an act of revenge without planning quickly snowballs into...