As the gang hatches an illicit scheme to get to the bottom of the deep-sea mystery, John B confronts Sarah while Pope jumps at the chance for revenge.

John B believes he's made a breakthrough in the hunt for the gold, but his desire to include Sarah in the quest causes friction among the friends.

JJ's reckless behavior ramps up when the friends try to score some quick cash. Meanwhile, John B grows closer to Sarah — and makes her dad suspicious.

An island crawling with law enforcement and a looming tropical storm are just two of the obstacles facing John B as he tries to make his escape.

JJ cooks up a risky plan to help out John B. Pope hunts down information about the key. Kiara and Sarah both deal with family fallout over the Pogues.

Armed with new clues, the group braves perilous roads and swampland as they race to keep part of Pope's history from falling into the wrong hands.