It is the year of the big heat wave, and many incoming ships have sickness aboard. They have to fly a yellow chequered flag, showing they are in quarantine for forty days, and warning all shipping to stay clear. One particular morning, Ten Cents, Sunshine, and O.J. are at the harbour mouth, waiting for cleared ships. O.J. is giving wise words to the switchers in case they become suspicious on any incoming ships. Zorran watches this nearby and keeps a distance from any ships, reasoning for a good chance to get extra income for Captain Zero. Meanwhile, O.J. can not handle the heat, so he sends Sunshine to go out to the bay to look for any ships. He finds Nantucket, but as Sunshine steams towards him, he brings his flag down. Already in a state of confusion, Zorran steams up and hurries towar