During the Massacre at Ayyadieh, King Richard "the Lionheart" was responsible for one of the worst genocides in human history. He ordered the slaughter of over 3000 Saracens, including women and children.
When he returns to England after his long Crusade, he wants all Saracens expelled from his country by any means necessary, even if it means bloodying his hands again.
Robin and The Sheriff of Nottingham were starting to get along... until Richard shows up and changes everything.
The Lion Returns is the third book in the My Lady Robin Hood series. Knowledge of the first two books is recommended.