Ok, the title for my Random House book is hammered down (pun intended, since one possible title was The Witch's Hammer... referring to the Malleus Maleficarum in translation).
The Witches' Trinity made it through the final meeting where it could be shot down, with just one eensy tiny change. The witches are now just a witch.
The book is officially titled The Witch's Trinity.
I'm happy with that, in fact wanted to suggest it since apostrophes are slippery things and confusing. Now it's just a simple, non-grammatically-perplexing possessive. And really, though there are several witches addressed in the novel, it's a first-person narrative from the point of view of the most important one.
I'm so thrilled this title made it through the fire (again, pun intended). I am awaiting my copyediting round and the arrival of cover art. Can't wait.