Brenan's Assassin - S1.E5

Robyn borrows an old book from the librarian and promises to bring it back because she needs to read it to find more information. When she arrives in Sherwood, she discovers that Brenan has put William under a spell to only obey her mistress. Robyn believes that Tea can change William back, but she must become Brenan to provide the potion to William easily. With audio technology, Robyn's grandfather is able to mix Robyn's voice to sound like Brenan and place the speech inside an audio cassette to play when she returns to Sherwood. When William is about to drink it, the real Brenan bursts in, but on the cassette, Robyn had recorded that someone has dressed herself as the mistress in order to get at William. The tape again repeated that William should drink what is in the cup, and he does. It works and Brenan escapes, locking the door behind her to trap both of them. Robyn returns to the present time when Brenan returns with the King to see only William. William explains the situtati