The waters around quiet city Boston aren't what they seem...

MK2 Alex Devereaux responds to a medical emergency on Gallups Island.

Alex and Professor Alvarez meet with the head of archaeology for Wenham-Hamilton Academic University at a Salem coffee shop. What they learn is more than they bargained for.

Alex takes advantage of a scheduled haul-out in Gloucester to check out the local fishing fleet. During his search for the Edme Morain, he stumbles into something else unawares.

Alex and Professor Alvarez meet with Agent Stone in her office to come clean about what's been happening. They all find out there's a larger picture yet to be seen...

Alex, Kerri and Professor Alvarez discuss and prepare for the next step in the investigation.

Alex embarks on a dangerous mission aboard the cutter Key Largo. He is to locate and board the fishing vessel Edme Morain to find out what it has been up to during its voyages away from prying eyes.