Need help finding a murder mystery

[kk1111]

I work with a lady who I found out writes murder mysteries. I knew she wrote but I never knew she was published. Anyway, she writes under a man's name and she is under contract to not say who she is. All I know is that the books are about these women who kill their husbands by poison. Sorry, it's not a lot of information but that's all she's allowed to say. If anyone can help that would be amazing!!!