Dr. Sophie Knowles teaches math at Henley College in Massachusetts, but when a colleague turns up dead, it's up to her to find the killer before someone else gets subtracted.

Math Professor Sophie Knowles shares her teaching venue with many other math and science faculty, most of whom she gets along with. But one in particular gives Sophie and her teaching assistant, Rachel, a hard time, thus annoying both women. When this colleague, a professor of chemistry, is found dead, poisoned in his office, Rachel is the prime suspect. It’s up to Sophie to put her talent for designing and solving puzzles to use to find his killer.

The Square Root of Murder

The Doctor and the Diva

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 swing, and campus is buzzing over the concert celebrating the bell tower's reopening. The building has been shuttered for twenty-five years, and Sophie's shocked to learn why--a student leapt from it to her death. But she's even more troubled by the secrecy surrounding the case. After Sophie performs some quick calculations, she's left with a nagging question: Was it really suicide? When one of Sophie's favorite students, a performer in the concert, is brutally beaten and left in a coma, Sophie's mind kicks into overdrive. The horrific incidents seem too coincidental to be unrelated, but can Sophie put together the pieces from a twenty-five-year-old murder before any other students get hurt?

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 complex than she ever knew. Now, Sophie must take on some rigorous deduction homework before the chances for another murder on campus increase exponentially...

After a weird math professor at Columbia University dies, P.C. and Mackenzie investigate the situation and discover that many students--and their parents--had motives for Professor Dunaway's murder.

When the Grim Reaper strikes the math department at a nearby university, P.C. and Mackenzie do some homework of their own and discover that almost everyone--parents, teachers, and students alike--had a motive to get this nutty professor out of the way.

A stunning debut novel the New York Times calls a "delectable romance"! Gottie's heart has been broken three times. One, when her best friend moved away without saying goodbye. Two, when her beloved grandfather died. Three, when her first love wouldn't even hold her hand at the funeral. As Gottie spirals deeper into grief, her past literally comes back to haunt her when she is inexplicably sent back in time to good memories and bad, revisiting afternoons of kisses and days she wanted to forget forever. This summer, Gottie's past, present, and future are about to collide—and she's the only one who can figure out why. The Square Root of Summer is an exponentially enthralling story about love and loss, from debut YA voice, Harriet Reuter Hapgood.