Among the Cape Ann community Jeff's pet dog is only popular with himself. The animal has gotten a reputation for stealing and the townsfolk want Jeff to get rid of him but he resists.
David and Jeff head to the port where the annual blessing of the fleet is to take place. But the number of people on the pier worries them so when they try to make it safe two men find vehement opposition.
After being dropped off on an island, the local ladies are enjoying their excursion. David and Jeff learn that an escaped convict is headed to where the women are, so they try to reach the area before the criminal does.
Captain Scott rescues young Billy Cameron after his boat blows up near the Scott Island channel. Billy convinces Scott a mine was involved and that ones remains in the water, needing to be found before more destruction or death.
Charlie Potter returns to his wife Jane after several years in prison but he unexpectedly brings an odd character with him. The man is found dead and Swift must find the murderer as rumors run rampant.
A freighter runs aground on a reef and the captain perishes. The crew, who abandoned the ship, blame a missing buoy which is where Captain Scott begins his investigation into the disaster.
A dangerous object is left carelessly on the dock and a young boy Bibber takes off with it. When the device is discovered missing a search is on for the lad before he's injured or killed.
An outbreak of encyphelitis occurs in the community and panic sets in among the community. Scott Island is rumored to have a vaccine they aren't sharing and Swift must move quickly to calm the hysteria.
Summer resident Michael Benson is not thrilled his daughter Barbara is spending time with local Danny. With the two youngsters disappear Michael and Cap'n Dan spend time arguing while David with Jeff organize a search.
Kay Wilson, a stranger to the area, charters Captain Swift's boat. But on their trip they encounter fugitive bank robbers which alters the situation. Swift must find a way to foil the criminals without injury or death.
An irascible older man is estranged from his grandson and just wants to be left alone. But David and Jeff think it is time for a reconciliation and hatch a plan to get the two men together.
An impending storm have the crew of a fishing boat worried but the captain refuses to alter his plans. The men are ready to take over the vessel rather than be caught in a hurricane and David must intervene.