Well done. Two story lines involving three women who have all experienced a life altering tragedy that left them seeking revenge. 
Reminded me of Harlan Cobens style - but not the suspense was as tightly written. And

Scott’s suicide was disappointing. I realize he needed to be removed from the storyline in order to have Ruth/Wendy/Naomi go off on her quest to find Mr Blue Eyes  - but if he really loved Ruth - he should have stuck with her

In the end -

I don’t know if we know why Bill - or Dan - stalked Ruth - and let Andrea live (because she killed Quinn?)