There's Gonna Be Another One...Right!?

A couple of days ago I finished Claudia Gray's Hourglass. Oh dear Lord, please tell me there's going to be a fourth book!! It cannot just end that way!! Suffice it to say that the end of this book was not what I expected. I'm hoping there's a happy ending somewhere down the road. I've read a few pages of The Time Traveler's Wife by Audrey Niffenegger. I've been busy planning a trip to New Orleans, so I haven't had as much time for recreational reading as I usually do.