Fletcher is the second book set into A.J.'s Prydain universe.
You don't need to read Beast to get into it, though it does give an edge as you'll be already familiar with the rules and customs of the world. Fletcher follows a completely different set of characters, with no prior appearances in the previous book.
Fletcher starts as a plain old tale of revenge: Ware Fletcher returns home to find it destroyed, and sets on a quest to make the person responsible pay. Along the way, he buys Lind, a rebellious thrall, as her skills could prove pivotal in his plans for revenge.
From there on, absolutely nothing goes according to plan, but tell you more might spoil some plot twists.
Prydain is a medieval fantasy world. It's not pretty, it's raw, violent and rife with inequalities. But as soon as you feel comfortable with that fact, Fletcher and Lind story might be - in my opinion - one of the sweetest romance AJ has ever built so far.
It's not instalove, it's a relationship building slowly through the obstacles they face alone and together.
Like all of AJ heroines, Lind is strong, intelligent and in her case, doesn't exactly shy at making it known, even when it can spell trouble for her. Fletcher is cunning, sometimes hotheaded, and 100% alpha. Both characters grow a lot during the novel, which could almost classify as a 'roadmovie' in terms of structure.
I really had fun reading their adventures, the snark and humor present through both main characters POV a balm for the sometimes bleak and violent world they live in.
I can't wait to see where in Prydain AJ will take us next!