When Sergeant Ben Fulton's family joins him on a cruise ship holiday, Ben, Josh, Maddie and Nan travel in luxury among the islands of the Caribbean while Caesar is in quarantine.
But a gang who have broken out of a Cuban prison have other ideas. They hijack the massive ship and hold its three thousand passengers to ransom.
With passengers of all nationalities in danger, only the United Nations can step in to help. Ben's best friend, Charlie, and the rest of the GRRR team assemble. Charlie will need super-sniffing explosive detection dog Caesar with him as he parachutes in to sneak aboard the ship.
Will Caesar and Ben be reunited in time to find the hidden explosive devices that threaten the ship? Can Operation Black Shark capture the modern-day pirates before it's too late?