A Monster Calls (with Liam Neeson as the monster) is due out in theaters this month. The movie is based on a book which was begun by Siobhan Dowd and finished by Patrick Ness. I wrote a booktalk for A Monster Calls in 2011. You can read it here.
It's too soon to tell if the movie will be as good as the book, but give yourself a chance to find out. Read the book first. Below is the original book trailer, followed by the new movie trailer.