Pisces Rising: Larkin and Colt, Book 2 (Unabridged‪)‬

The research submarine Pisces has been stolen from the San Diego Oceanographic Institute. The thing is, nobody can figure out why anybody would want it. It has limited range and highly specialized uses, and anyone attempting to use it or sell it would attract a lot of attention. Asked to look into it, David Larkin and Samantha Colt soon find themselves following a trail of mayhem and murder across several states, uncovering a plot that, if successful, could cost millions of people their lives.