A revolutionary device called the Longitude Chronometer, a device that can tell a sailor exactly where he is in the world is stolen from the HMS Petrel by pirates lead by the legendary but supposed dead Edward Teach--better known as Blackbeard. Tom Lowe, an English spy aboard the Petrel, has been given orders to protect the device and to kill Blackbeard at all costs.moreless
Blackbeard's master plan faces obstacles when a popular pirate captain arrives. Meanwhile, Kate asks Tom to examine her husband, and Tim discovers a corpse in the harbor.
When Jagger captures Kate on a trading voyage, Blackbeard sets out to find her and kill her rather than risk a pitched battle with the English. James, realizing what the commodore intends, asks Tom to go along and ensure that Kate is safe.
Tom warns Blackbeard that his condition is worsening in a gambit to get the pirate to reveal his plans. However, when Blackbeard accelerates his scheme, Tom is forced to play along. Meanwhile, Jagger turns to an unexpected resource to learn Blackbeard's location when all else fails.
Tom tricks Blackbeard into letting him go to Jamaica, but discovers that Jagger plans to spare no one once he learns the location of Santa Campana. Meanwhile, Nenna plans to spend her stolen loot and James begins to regain the use of his body.
Jagger speaks with Antoinette in the Jamaica prison. Meanwhile, Tom tries to figure out a way to deliver Blackbeard to the authorities while guaranteeing Kate's safety.
Nenna plans an escape, putting Tom in peril. Meanwhile, James forms an unlikely alliance that could get Tom killed.
Blackbeard sets his plan to sink the Spanish Treasure fleet and recover the treasure. He has Tom stay behind, and Kate gives the Englishman startling news.
Jagger launches his final assault against Santa Campana and brings along a secret weapon to destroy his hated enemy. Meanwhile, Blackbeard and Tom rally the townspeople to make their final stand against the English.