Set in the French-inspired kingdom of Belterra, "Serpent & Dove" follows Louise "Lou" le Blanc, a witch who becomes a thief to evade her coven. Her life takes an unexpected turn when circumstances force her to marry Reid Diggory, a devout witch-hunter (Chasseur). The novel explores the ancient war between witches and the Church, Lou and Reid's evolving, enemies-to-lovers relationship, and the dangerous secrets Lou harbors. As their feelings grow, Lou must confront the powerful enemies searching for her, bringing a fate worse than fire, while Reid struggles with his duty and his growing affection for the woman he believes is his enemy.