The Royal Four Series by Celeste Bradley

Last week, I broke down the novels that make up Celeste Bradley's spy series, The Liar's Club, including: The Pretender, The Imposter, The Spy, The Charmer, and The Rogue. A historical fiction collection that focuses on characters during the War of 1812. The club as well as the royal four are a part of a spy ring for the king. The two series intertwine with their characters, and overlap their storylines. However, those in charge of The Liar's Club take their orders from The Royal Four. 
Since I'v...