I'm looking for a book I don't know the title or author to.
I read it a few years back, I believe it was in 2014 or 2015 or even 2016. It is a werewolf fiction about an alpha named Cain and the heroine's name is Charlotte. Alpha Cain has a beta with a name that starts with a R. The beta's mate is also Cain's mate, Charlotte. I think she's human, but I'm not sure. She has another mate who is also an alpha, but I forgot his name. The male leads are all very tall, 6"5 and over.

If you know the book please message me and let me know.  I am very desperate.