Well, really a trilogy. The Crimson Lake trilogy by Candice Fox, to be exact.
We are Candice Fox groupies in this house. We’ve been to three of her author talks over recent years and love her stories. They are dark and disturbing but the characters are so well-developed and strangely relatable, even when they are taking vile actions we would never dream of.
Book one is Crimson Lake, book two is Redemption Point and book three is Gone by Midnight. Highly recommended!
You can read more about the Crimson Lake trilogy on Goodreads.