Isn't it pretty??
Here is the closest I could find to a summary... it is from an interview with Beth!
"... [a] dark-but-fun, supernatural romance about two teenagers who discover they have a shared destiny, related to the old novel The Strange Case of Dr. Jekyll and Mr. Hyde. Unfortunately, the more the shy heroine, Jill, starts to fall in love with the mysterious hero, Tristen, the more dangerous he becomes to her. There’s lots of mystery and twists and turns to the plot."
I can't wait for this book! I think it sounds even better than Jessica's Guide to Dating on the Darkside!