You can find the book on:
Barnes & Noble
To my iBookstore readers: It appears that Apple has chosen to censor Twist Me due to its content. As a result, it won’t be available on the iBookstore in time for the official February 11th release, and I don’t know if it will ever make it on there (though I’m currently working with them on this issue). I’m deeply saddened by this, and I’m sorry to disappoint all of you. Hopefully, this can be resolved over time, and for now, I believe that you could still read the book on your iOS device via the Kindle, Nook, or Kobo app.
As always, anything you can do to spread the word, including leaving a review or mentioning the books to friends, is hugely appreciated!