Borrowed Time — L.A. Boruff

Turning forty is less Witches of Eastwick and more Black Widow. Go figure. I've always known I was adopted. It never mattered much...until my birth mother died. I inherited a new power from the mysterious woman. But now she's dead and I, despite the fact that I have exactly zero training, I'm the next time-traveling assassin. Don't get excited. The job sounds glamorous, but it comes with a huge learning curve and plenty of mishaps. Then there's having to actually assassinate people. That part sucks. It could be worse. I could still be working retail.