The Secrets in Shadow and Blood by Lana Pecherczyk — book slip

Violet wakes thousands of years after a nuclear holocaust to find a world where Fae and vampires rule, keeping humans in the wasteland.

As a covert assassin, she seeks revenge for humanity, but her mission blurs when Indigo, a Fae Guardian and vampire, saves her life.

Tasked with finding a human with deadly secrets, Indigo is drawn to Violet, despite the addictive danger her blood poses. As they navigate a world of magic and betrayal, their fates intertwine in unexpected ways.

First in the Season of the Vampire Trilogy, part of the Fae Guardians series.