SOLVED. Romance suspense novel about siblings who are arsonists. Spoilers ahead [s]

[Sasha]

Anyone know the title of a book where:
A set of brothers are Arsonists?
They would set fires to empty buildings and they had this ritual they would do in the woods
There is a set of twins and one of them died
Also the first letter of each siblings name from oldest to youngest spells out the word A.R.S.O.N.S.
they have a little sister (her name started with S) but she knows nothing about the fires and what her brothers do

[Lobstergirl, au gratin]

When did you read it?
YA, NA or adult?
Where and when is it set?

[Kris]

Sasha, who are main characters and the main romantic couple? How did the couple meet?

[Sasha]

I read it about 8-10 yrs ago. I think. The lead character is the only female sibling, her name begins with an S and her romantic interest is a detective. Its a small town setting and there is a forest

[Ayshe]

Fatal Burn? Searching inside the google book, it seems to have letters-forming-arsons scene.

[Sasha]

It seems like it!!. Thank you so much!!!