Robin and the gang have been busy constructing their ingenious new camp, but, when Knighton Hall is razed and Marian and Edward are taken to the castle under house arrest, it's clear that the rules have changed.
In his first mission since discovering the devastating truth about operation Shah Mat, Robin launches an abortive raid on Nottingham Castle's new Strong Room.
When a group of boys accidentally stumbles on Gisborne's weapons testing site, all but one is taken prisoner.
When the alarm's raised, Robin hatches a plan. But with Gisborne armed to the hilt in an indestructible suit of armour, a rescue attempt is more difficult than it might first appear.
Robin must think fast if he\'s to save a boy's life and stop a vital part of the Sheriff's war machine...
The Sheriff and his sinister scientist, Joseph (pretending to be the Nightwatchman), test a poison, blaming the ill effects on the pestilence.
A horrified Robin realises that his plan to capture the Sheriff's spy, Henry of Lewes, has failed because he has a traitor in his gang. Fearing for Marian's safety in the castle, Robin sets about rooting out the turncoat. His only clue is supplied by Marian: the spy's meeting place is located at the Trip To Jerusalem Inn, where the traitor outlaw sells his secrets to Gisborne.
The Sheriff's Black Knights gather at the castle to attend a feast and declare their allegiance to Prince John by signing the Great Pact of Nottingham. With the outlaws disguised as entertainers, Robin infiltrates the castle to join forces with the only man who can stop them: former Sheriff Edward's old ally and Black Knight, the Sheriff of Winchester. Winchester's territory is key to the Sheriff's Shah Mat plan that will apprehend a homecoming King Richard at the southern ports.
Robin is determined to get hold of the Great Pact of Nottingham, written proof of the Sheriff's treason. So when lovelorn Knight John of York and his chest of silver pass by Robin and the gang, and the Knight begs the outlaws to take pity on him and save his girl, Robin formulates a plan.
Marian wakes up in Sherwood Forest on the first day of the rest of her life as an outlaw with Robin and his gang. Surprising everyone with a new energy and recklessness, however, she jeopardises the gang's mission to bring aid to Clun Village after it's ransacked by the Sheriff's men.
A mortally wounded, one-legged messenger from King Richard flees Locksley Manor pursued by Gisborne's men and ends up in the arms of Robin. In his dying breath, he tells Robin that the King needs him to return to fight in the Holy Land, and utters the word "Lardner".
The Sheriff is furious that the messenger got away, especially now that he and Gisborne are also on the hunt for Lardner, having received a prediction from a fortune-telling Fool that the "ring of Lardner" spells trouble.
The Sheriff disappears into Sherwood while sleepwalking as a messenger of Prince John arrives and sends word of his absence. The Prince plans to burn down Nottingham and Gisborne turns to Robin to help track down the missing Sheriff, and save the people of Nottingham.
A messenger from the King arrives with a mission for Robin, but they are all surprised when the King's treasure is revealed.
Robin and the Outlaws arrive at a barn for Robin's birthday party, only to find that they are surrounded by The Sheriff's mercenaries and won't be let out alive.
The Outlaws share their secrets with one another whilst the traitor, Allan A Dale, realises that The Sheriff and Gisborne are heading to the Holy Land tohug the King. Fearless Marian takes it upon herself to stop the Sheriff in his tracks while Allan must choose his allegiance. Will Robin realise that the mercenaries are merely there to distract him from The Sheriff's new dastardly plan, and will Allan come to his senses?
While sharing secrets, Djaq admits to Will that she loves him.
Robin and the Outlaws, The Sheriff, Gisborne and Marian are now in the Holy Land. Robin warns the King of the impending threat to his life, but The Sheriff's cunning has prevailed; instead of a heroes' welcome, Robin and the Outlaws are treated as traitors...
Marian makes a final attempt to redeem Gisborne if hehugs The Sheriff, he will have everything he wants, including her. Will fear of The Sheriff or the smell of power win the battle for Gisborne's soul?
The battle for England is on. Will Robin be released in time to save the King's life? Will Marian escape from the clutches of The Sheriff? High stakes and ultimate tragedy ensue...