Jonathan Oliver is chasing down an intruder on Lake Oswego's Iron Mountain when he discovers some long-buried artifacts. One of these relics sparks a remarkable spinoff from the Oliver family's anti-gravity inventions. Together, Jon and his father incorporate their breakthrough into a revolutionary submersible design. At the invitation of Dr. Graham MacKenzie, the Gyrosensors team travels to one of Scotland's wildest and remotest regions-and its deepest...