Terminal Depth

Six months after the Midnight Express, Cassie thought the hardest part was over. She was wrong.
When the Syndicate begins moving something vast and catastrophic along the floor of the Atlantic Ocean, Cassie and her team have one window to stop it - from the inside. But the deeper they go, the clearer it becomes that Julian didn't just anticipate their mission. He designed it.
Six hundred miles per hour. Eight hundred metres down. No way out but forward.