Dating A Hitman (The Dating Series #4)
B.T. Love

Scarlett shows up to her dad's house expecting to meet her half brother Eli, but instead is met by a handsome man named Troy Valenti. Her family warns her to stay away from Troy because of the activity he is involved in, but that only moves her to pursue him more.
After finding out his secret, she finds herself falling for the dangerous man that he is. But the feeling is mutual, and Troy gets wrapped around her finger as well, falling for a woman he was told to stay away from.