Samantha Kell finally reveals what happened aboard the doomed research vessel Veloscora — and why her mission is more urgent, and more dangerous, than the crew of the Invenios could have imagined. As tensions rise and secrets unravel, Tulley and Oberlin must decide whether to help a mysterious stranger or protect their ship from getting pulled into a deadly deep-sea conspiracy. Meanwhile, flashbacks to a covert recovery mission expose the real reason Samantha was at sea — and the life-or-death cost of what she’s carrying.