The longest day begins in Kilmore Cove. While the rain covers everything around with a thick gray veil, the calm in the harbor is disrupted by thunder and sudden fiery flashes. But it's not thunder or lightning—it's the incessant volleys of eight guns from the Mary Gray, Captain Spencer's legendary ship. The pirate is settling a score with twins Jason and Julia Covenant. The guys had to fight the most terrible enemy without the help of Ulysses Moore, who still had not managed to defeat him...