The treachery of beautiful things - Ruth Long

The trees swallowed her brother whole and Jenny was there to see it. Now seventeen she revisits the woods where Tom was taken resolving to say goodbye at last. Instead she is lured into the trees where she finds strange and dangerous creatures who seem to consider her the threat. Among them is Jack, mercurial and magnetic, with secrets of his own. Determined to find her brother with or without Jack's help, Jenny struggles to navigate a faerie world where stunning beauty masks some of the most treacherous evils.