Secret Guardian by K Leigh

After losing her parents as a teenager, Darian Smith grew up with the instinct to expect the worst. As an adult, that hasn’t changed. Whether she’s working as a nurse in the ICU at her local hospital, keeping her free spirited aunt in line, or feeding the stray cats that meander around her apartment complex, there’s never a moment in her life where she’s not on guard.

Then one night changes everything, catapulting Darian headfirst into a world she never knew existed… and she finds out someone has been watching over her this whole time.