There will be little time for Mary, Queen of Scots, and her ex, Bash, to process their emotions over his surprise wedding to Kenna in the last episode of “Reign,” as this week there is some serious political drama and treachery in focus. Adelaide Kane’s Mary is about to find out that there is a secret clause in her marriage contract (to Prince Francis) that could threaten not only her royal power, but her beloved Scotland. It will test the strength of the young newlywed, as she has to figure out how to handle not only French monarchs Henry and Catherine, but her own sneaky, power-hungry