Dopo un uragano, John B, JJ, Pope e Kiara si buttano a capofitto nei pericoli e nell'avventura dopo aver trovato un misterioso relitto sommerso.

La banda escogita un piano illegale per andare a fondo del mistero sottomarino e John B affronta Sarah, mentre Pope prende al volo un'opportunità di vendetta.

John B finalmente scopre la verità sul padre e scatena una serie di eventi che mettono a rischio tutto ciò che lui e i suoi amici hanno cercato faticosamente di ottenere.

John B, Pope, JJ e Kiara si preparano allo scontro finale sulla nave, mentre Sarah scopre la dura verità sulla sua angosciante situazione familiare.

An unexpected rescuer takes the Pogues from a remote island to Barbados, where they encounter a powerful treasure hunter with his own agenda.

As her friends mount a rescue attempt, Kiara agrees to an uneasy truce with Rafe. A familiar sound grabs John B's attention.

Big John and John B pick up where they left off — for better or worse. Cleo and Pope form a new club. Rafe reconnects with Ward.

An emotional homecoming is easier for some than others. Big John searches for the diary. Ward's plans for a prized possession don't sit well with Rafe.

Sarah convinces an old friend to help with a high-risk, high-reward mission. Looking to access a museum collection, John B and his dad get creative.

Secrets threaten to drive a wedge between John B and his friends. Sarah revisits a past life. Pope reaches a breaking point.

With Singh on the move, John B and JJ scramble to catch him. Pope makes a breakthrough. Sarah questions where her loyalties lie.

Rafe lays his cards on the table and Sarah calls in two favors. JJ's unorthodox plan to get to South America lands John B in hot water.

With their ride to Orinoco waiting on the tarmac, Kiara and JJ run into several complications. Rafe has a change of heart.

The Pogues' search for El Dorado brings them deep into the jungle, where John B and Sarah face the ultimate test of their courage and family bonds.