The episode starts with a treasure hunter finding treasure. We then learn that the treasure is being put on display.
Then we have a pirate ship over take a tug boat. The ghostbusters get called to to deal with the ghost pirates that have taken over the ship. They have a breif fight and get dumped in the water by the ghosts. The ghosts escape on their ship and proceed to search the city for their missing treasure plus whatever else they can find. The ghostbusters figuring out what the ghosts are after set a trap for the ghosts at the museum Where they finally capture the ghosts.