What's the Name of That Book??? discussion

I am looking for a book series about sisters (they might be twins) and either their father is a serial killer or they are. That’s all I remember. Can anyone help me?

Also, the book cover has a sundae on it with a cherry on top, I think?

Based on the serial killer theme and your description of the cover, could it be Erin Lee's 'Diary of a Serial Killer' series?

Gabriella, is this book series for adults or teens? How old are the sisters?

What do the killer's victims have in common? Location?

Can you tell us more about this family? What are their jobs?

I found it, it’s called Slice of Cherry , I found it on someone else’s list of books. I think the title is what threw me off a little bit and made me think it had a cherry on the cover.