Dr. Sophie Knowles is a professor with a way of making even the most complex math problems fun for her students. But when the school's beloved librarian is found shot to death in the stacks, Sophie learns that her friend was more comp...

Dr. Sophie Knowles is a math professor with a knack for creating complex puzzles that delight her students. But now, at the close of the academic year, she must solve a crime that doesn't quite add up… At the math department's grad...

Dr. Sophie Knowles loves using puzzles to make math fun for students. But when winter seizes Henley College, she must thaw out a cold case to track down a killer-her most difficult puzzle yet . . . Winter Intersession is in full swin...