Determined to conquer the Riemann hypothesis despite cultural discrimination against women intellectuals, a genius mathematician uncovers a mysterious theorem's unexpected World War II link to her family.

As a young girl, Katya Geller learned from her mother that math was the answer to everything. Now, at forty, she finds this wisdom tested: she has lost the love of her life, she is in the middle of a divorce, and has just found out that her mother is dying. Half-mad with grief, Katya turns to the unfinished notes for her mother's last textbook, hoping to find guidance in mathematical concepts. With humor, intelligence, and unfailing honesty, Katya...

"Rakel has a rare talent for math, but she has never mastered the art of making friends. At nineteen, she moves to Oslo to attend university, and meets Jakob, a brilliant, older teacher. He is also working on a novel about Sofja Kovalevskaja, the first woman who became a professor in Mathematics. Just as Kovalevskaja was very close to her much older advisor, Rakel and Jakob are instantly drawn to each other and eventually become lovers, although he...

"Germaine Johnson doesn't need friends. She has her work and her Sudoku puzzles. Until, that is, an incident at her insurance company leaves her jobless--and it turns out that there are very few openings these days for senior mathematicians with zero people skills. Soon enough though, Germaine manages to secure a position at City Hall answering calls on the Senior Citizens Helpline. But it turns out that the mayor has something else in mind for Germaine:...

"For type-A mathematician Catherine Lipton, growing up with a free-spirited single dad was more than a little stressful. So as an adult, everything in her life is ordered, from her lists to her lesson plans at her new job as a college professor. Catherine's carefully calculated life goes awry, though, when the university's human resources system rejects her employment paperwork. Soon after, her credit card is declined. At the social security office,...

"Lady Daphne Forsyth is a brilliant mathematician with a burning passion for puzzles. When she learns that the library belonging to her benefactress houses the legendary Cameron Cipher--an encrypted message that, once solved, holds the key to great riches--Daphne is on the case. Unfortunately, her race to unlock the cipher's code is continually thwarted by a deliciously handsome distraction she hadn't counted on...and cannot resist. Dalton Beauchamp,...