Hannah Torrington lives a perfectly normal and ordinary life until the night her sister is murdered by vampires. Saved by a Lycan named Will and thrust into a world she never knew existed, Hannah is taken to a secret facility that trains men and women to hunt vampires. Determined to take her revenge for her sister's death, Hannah joins the recruit program. As she is pushed to the brink of physical and mental exhaustion by the intense training, she fights her forbidden attraction to her instructor Will and struggles to adjust to her new life.