The rosemary spell - Virginia Zimmerman

Part mystery, part literary puzzle, part life-and-death quest, and chillingly magical, this novel has plenty of suspense for adventure fans and is a treat for readers who love books, words, and clues. Best friends Rosie and Adam find an old book with blank pages that fill with handwriting before their eyes. Something about this magical book has the power to make people vanish, even from memory. The power lies in a poem-a spell. When Adam's older sister, Shelby, disappears, they struggle to retain their memories of her as they race against time to bring her back from the void, risking their own lives in the process.