I received an ARC through NetGalley and this is my voluntary and honest review.

Cyra's little sister, the one she's been protecting all their lives, has been murdered. Cyra doesn't grieve like she's expected to - instead of crying, she locks away her feelings, and focuses on facts and solutions. How can she find the one who killed her sister? Well, by infiltrating a support group for serial killers, of course.

I'd say this was a good one-time read. Cyra was an interesting character, and there were some twists at the end that I definitely didn't expect.  I also liked that her relationship with Mira wasn't perfect - in fact, the little sister is a bit exploitative. Still I felt like something was lacking to make me really invested. The male serial killers didn't have anything new to offer.