What happens when Reign's Mary and Francis are taken hostage?
On Thursday's episode, the castle is under siege, and Mary (Adelaide Kane) and Francis (Toby Regbo) must do whatever they can to save themselves. But before that, Catherine (Megan Follows) makes a surprising declaration by offering up Mary in a trade.
Reign airs on Thursdays at 9/8c on The CW.
(Full disclosure: TVGuide.com is owned by CBS, one of the CW's parent companies.)