Themes: Life Lessons, Values, Identity, Good vs. Evil, Temptation, Mystery, Fiction, Teen, Young Adult, Chapter Book, Hi-Lo, Hi-Lo Books, Hi-Lo Solutions, High-Low Books, Hi-Low Books, ELL, EL, ESL, Struggling Learner, Struggling Reader, Special Education, SPED, Newcomers, Reading, Learning, Education, Educational, Educational Books. First Vivi Calderon finds old letters hidden in some library books while doing research. Then and odd-looking man starts stalking her. Are these strange events related? The letters seem to hold clues to an unsolved homicide. Did Vivi's stalker get away with murder? Written specifically for struggling readers to explore genres, like mysteries and science fiction, these fast-paced books hold student interest until the last page. Questions at the end of each title promote cognitive development by making students think about vocabulary, comprehension, character, and plot.