Robin, Earl of Huntingdon, returns to Locksley from fighting with King Richard in the Crusades, but England is not as he left it and all attempts to resume his former life are foiled by the Sheriff of Nottingham.
Robin captures a tax inspector and plots to heist the year's taxes, but a surprise is in store for both him and the sheriff; Marian makes her own preparations after a row with her father, and Gisbourne makes his intentions clear.
Allan A'Dale's brother comes to Locksley and keeps putting his foot wrong; meanwhile at Nottingham the Sheriff is convinced there's a spy leaking info to Robin, but the trap Gisbourne sets has far-reaching consequences.
When Gisborne betrays a friend to obtain Greek Powder for the Sheriff, Robin scrambles to find the recipe and stash of powder before the Sheriff turns it against him. Elsewhere, Much is unexpectedly promoted, and Marian puts her trust in the wrong man.
The glorious news spreads that King Richard is returning to England. For most it hails a return to the good old days, but for Will and Allan it means a return to their lacklustre former lives - and for Robin and Marian it means her impending marriage to Guy of Gisborne. Robin is desperate to find evidence convicting Gisborne of his crimes, while Marian sets out on one last mission as the Nightwatchman. But tragedy strikes and as the Sheriff and his men surround Robin and the gang it seems that Marian and Robin will be separated forever- if not by Gisborne and the ...
Robin cannot come to terms with losing Marian. He refuses to help Edward in confronting the King and abandons Much and the gang: his world has fallen apart. There is no point in being Robin Hood anymore. But all is not what it seems and the discovery of a terrible secret will spur Robin back into action and see the Sheriff and Gisborne defeated before the day is out.