Coup de Grace

Coup de Grace

Available on Prime Video
S4 E13: Darnley teams up with John Knox to strip Mary of her throne, which will leave a close friend of Mary's dead. Elizabeth must banish Gideon from court at the request of her future husband, while Charles takes a bold stance against his brother Henri (guest star Nick Slater).
Starring Steve Byers, Nick Slater, Adam Croasdell