The Broken Girls by Simone St. James (2018)

Adore Simone St. James, and this book is wonderful. 

Going back and forth in time between a girl's boarding school in the 50s and the ruins of the school in contemporary times, with a few mysteries involved, this is a lovely, involving novel. 

I love Simone for her excellent characters, relationships, sense of time and place and for not wussing out on the supernatural. She brings it! Love her.