Ducking and Diving

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. Luckily,Henry has arrived at the castle unconscious and Robin can also depend on Marian's spying and loyal wise-woman Matilda to help him in his mission. Can Robin silence Henry and rescue Matilda before the Sheriff ducks her for witchcraft, and will he work out who the traitor is?