In George R.R. Martin's A Song of Ice and Fire, the knights and lords who strive to live honorably often find themselves conflicted. A Harsh Mistress, the fourth Chapter Pack in the "Beyond the Narrow Sea" cycle, carries the demands of duty in A Game of Thrones: The Card Game from the wintry North to the Free Cities of Essos.

Filled with unique locations, characters, and powerful attachments, A Harsh Mistress continues to the develop the game's focus on its unique personalities. Its sixty new cards (three copies each of twenty different cards) allow players to relive the conflicts of duty and honor, relaying commands to their characters and imposing duties upon their opponents. Unique locations, characters, and powerful attachments fill this Chapter Pack, along with two new plots that continue to the develop the game's focus on its unique personalities.