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.