El Diablo is in the details in this Latinx pirate fantasy starring a transmasculine nonbinary teen with a mission of revenge, redemption, and revolution.. On Mar León de la Rosa's sixteenth birthday, el Diablo comes calling. Mar is a transmasculine nonbinary teen pirate hiding a magical ability to manipulate fire and ice. But their magic isn't enough to reverse a wicked bargain made by their father, and now el Diablo has come to collect his payment: the soul of Mar's father and the entire crew of their ship. . When Mar is miraculously rescued by the sole remaining pirate crew in the Caribbean, el Diablo returns to give them a choice: give up their soul to save their father by the harvest moon, or never see him again. The task is impossible--Mar refuses to make a bargain, and there's no way their magic is a match for el Diablo. Then Mar finds the most unlikely allies: Bas, an infuriatingly arrogant and handsome pirate--and the captain's son; and Dami, a gender-fluid demonio whose motives are never quite clear. For the first time in their life, Mar may have the courage to use their magic. It could be their only redemption--or it could mean certain death.