How I'll Kill You by Ren DeStefano

Your next stay-up-all-night thriller, about identical triplets who have a nasty habit of killing their boyfriends, and what happens when the youngest commits their worst crime yet: falling in love with her mark.

Make him want you.
Make him love you.
Make him dead.

Sissy has an...interesting family. Always the careful one, always the cautious one, she has handled the cleanup while her serial killer sisters have carved a path of carnage across the U.S. Now, as they arrive in the Arizona heat, Sissy must step up and embrace the family pastime of making a man fall in love and then murdering him. Her first target? A young widower named Edison—and their mutual attraction is instant. While their relationship progresses, and most couples would be thinking about picking out china patterns and moving in together, Sissy’s family is reminding her to think about picking out burial sites and moving on. 

Then something happens that Sissy never anticipated: She begins to feel protective of Edison, and before she can help it, she’s fallen in love. But the clock is ticking, and her sisters are growing restless. It becomes clear that the gravesite she chooses will hide a body no matter what happens; but if she betrays her family, will it be hers?