This is a fun book to read - lots of twists and a very unexpected ending. I read it 5 or 6 years ago, and wanted to again, but I couldn't remember the title or author's name. I have been searching for it for months!
All I could remember was that it was about a teenaged girl whose nickname was Junebug. She lived with her father - mom was not in her life. One of her parents had a large collection of butterflies and moths and it was set in the south. People are not who or what they seem to be - there's a slightly scary undercurrent. It is not a "chick flick" type of book at all.
I had forgotten about a site I bookmarked a while ago: https://www.makeuseof.com/tag/how-to-find-a-book-without-knowing-the-title-or-author/ The second suggestion was to use Google book search and there it was.
It has nothing to do with Physics so don't let the title scare you. I recommend it and intend to read it again as soon as I finish the ones I have now.