‘Invisible is a great thriller. I can’t say too much more about the plot because the twists and turns are the whole point of reading a book that wrong foots the reader at every turn . . . Christine Poulson kept me reading by giving out just enough information to intrigue and puzzle so that I had to read just one more chapter. That’s why, in the end, I just dropped everything else and read the last half of Invisible in one sitting.’