Harlow by Katie May

Belladonna has two meanings—beautiful lady and deadly nightshade.
I’m both.
When my job as an elite assassin sends me overseas to Scelestus College, I think it’ll be a quick in and out.
Find a kidnapped little boy.
Murder the kidnapper.
Return home.
What I don’t expect is for Scelestus to be home to some of the worst criminals who have ever walked the streets. This is where their children go to learn, make connections, and develop alliances.
There’s Eliana and Easton, a pair of thieving twins. Eliana insists that I become her new best friend. And Easton hints he wants something…more.
Gabe, an aloof mafia heir with a penchant for hiding out in the library.
Bennett, my angry and sexy professor who infuriates me just as much as he arouses me.
And finally, Kingsley, the golden god, the football star…and also my target’s son.
After I poison my victims, I leave a lipstick stain on their cheek. I call it the Kiss of Death.
But these four boys bring me back to life.
I’ll do anything to keep all of us alive…including becoming an even bigger monster than the world turned me into.