Lambert, a friend of Sir Guy of Gisborne and castle scientist, realises that lives could be at risk if his latest invention were to fall into the Sheriffs hands. When Lambert won't make more of the invention, an "explosive" black powder, he is put into the dungeons by the furious Sheriff. Much volunteers to get himself arrested so he can help Lambert from within, but will he get more then he has bargained for?

Robin saves an arsonist from burning Locksley Church and brings him back to the forest, the gang are reluctant to feel sympathy for him - until they realise who he is and where he's been. Peace is on the table as an emisary from Saladin visits England to negotiate with Prince John, but instead the Sheriff attempts to hold him for ransom. When Robin discovers the plot, he makes plans for the ransom money - but what will he have to face to get it?

When Little John's son is arrested in Locksley, John moves to protect his son from the Sherrif's law - and is quickly thrown in Nottingham's dungeon. Alice is suprised to find her husband is still alive.

Gisborne awaits his execution in a Nottingham dungeon, and meets a fellow prisoner who has a profound effect upon him. Robin thinks he can strike a deal with Sheriff Isabella, but his plans are thwarted when an unexpected stranger from her past arrives, looking for revenge.

The gang are shocked when Robin announces that Gisbourne is joining their fight against Isabella, but can their uneasy truce survive? Robin and Gisbourne then travel to York to save their half-brother Archer from execution, and find that he has made a formidable enemy in the Sheriff of York.