The My Sister the Vampire Series in Order

About the My Sister the Vampire series

Series Premise

The core premise follows identical twin sisters separated at birth who reunite in middle school and discover they are complete opposites in style and secret heritage. Olivia Abbott, a bubbly, pink-loving vegetarian cheerleader, moves to Franklin Grove and meets Ivy Vega, a pale, goth girl who adores black clothes and rare steak. Their instant bond leads to the shocking revelation that Ivy is a vampire—a fact hidden from the human world—and Olivia, despite her differences, is accepted as a “Bunny” (human) in the vampire community. The twins navigate school life, friendships, family secrets, and the ongoing need to keep Ivy’s true nature concealed from humans while protecting the vampire society’s secrecy. Stories often involve twin switches, school events, crushes, minor mysteries (like who’s spreading rumors or causing trouble), and the challenges of blending two very different worlds.

Main Characters

At the center are the identical twins: Olivia Abbott, the sunny, optimistic cheerleader who loves pink, pom-poms, and fitting in, yet proves brave and loyal when secrets emerge; and Ivy Vega, the cool, sarcastic goth who embraces her vampire side, adores black everything, and navigates her dual life with dry wit and protectiveness. Their adoptive parents differ—Olivia’s warm, supportive human family and Ivy’s loving vampire father, Karl, a film buff with a dramatic flair. Recurring characters enrich their world: Sophia Hewitt, Ivy’s loyal best friend and fellow vampire with a punk style and quick humor; Brendan Daniels, Ivy’s sweet, steady boyfriend who shares her gothic tastes; Camilla “Cam” Edmunson, Olivia’s bubbly human best friend and film enthusiast; and various schoolmates, teachers, and vampire community members who add color, rivalries, or support. The twins’ growing circle of friends—both human and vampire—forms a welcoming, accepting network.

Setting

The primary setting is Franklin Grove, a quiet, seemingly ordinary small American town with a hidden twist: a significant population of vampires who live openly among humans by blending in and following strict secrecy rules (no biting, no revealing fangs). The twins attend Franklin Grove Middle School (later high school), with familiar backdrops like classrooms, the cafeteria, cheer practice, the mall, local diners, and their respective homes. The vampire community adds subtle gothic flair—dark clothing trends, a preference for night events, and occasional nods to their heritage—but the town remains cozy and relatable, grounding the supernatural in everyday tween life.

Tone & Themes

The tone is cheerful, bubbly, and gently humorous, with a light, playful vibe that keeps things fun and never scary. Mercer’s prose is breezy and accessible, full of witty dialogue, exaggerated twin contrasts, and feel-good moments that celebrate differences rather than fear them. It’s wholesome paranormal fun—no gore, no real horror—focusing on laughs and heart. Themes emphasize acceptance of differences, the unbreakable strength of family (especially sisterhood), self-confidence, friendship across divides, the joy of discovering who you are, and the idea that opposites can complement each other perfectly. The books promote kindness, loyalty, and embracing individuality in a world that sometimes demands conformity.

In the end, the My Sister the Vampire series delights as a bubbly celebration of sisterhood that proves differences make the strongest bonds. Sienna Mercer spins tales full of laughter, loyalty, and light-hearted magic, reminding young readers that being yourself—pink or black, human or vampire—matters most when you have someone who loves every part of you. The books leave hearts happy and spirits lifted, a cheerful reminder that family, friends, and a little fang-tastic fun can conquer any middle-school chaos.