First Kill by Victoria "V. E." Schwab

[Cranberry]

You can read the short story this series is based on in the anthology Vampires Never Get Old: Tales with Fresh Bite (Zoraida Córdova/Natalie C. Parker), or directly here.

From the show's promo materials it's looking like the pilot will follow the short story pretty closely! It'll be interesting to see what, if anything, they change or add. For one thing, it seems like the show is

Spoiler

giving Juliette and Elinor a brother, Oliver, who apparently ran away prior to the show.