A heat wave hits Nottinghamshire and, when Prince John blocks all the local wells, the outlaws are forced to take desperate measures to save those at risk.

Prince John discovers Robin and Isabella's secret relationship, and orders Gisborne to dispose of them, telling him that if he completes the task he will be made the new Sheriff. Isabella proposes a life away from Nottinghamshire, and Robin has to make a difficult choice about his future.

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.