Charm

They are not exactly like Harkness but I have read a number of their books and I think you might like them Lori Handerland writes about werewolves one I like is Dark Moon, not read all the others. Keri Artur has written loads of books she features vampires and werewolves also good partic Ripple Creek series and spook squad and Kim Harrison a witch, should get them cheap too been out for ages.