Female Friendships cause Time Rifts

I just raced through the first look, so I think all I've got right now is: I want to read more. Coming of Age, Accidental Murder at a concert, older self attempting to save(?) younger self, forces of good(?) vs. forces of evil(?) battling it out across the timeline? Bring it on. So many questions, and now I have to wait for September for answers, and I don't have the capacity of alter time to get there sooner. Daughters of Harriet, help me out here, ladies!