Sarah is enjoying a sabbatical from her studies and has found herself in St. Louis, where—for once—life feels good.
She's in love with Derry, a bright and charming math student, surrounded by friends, and her biggest worry is whether she wants to return to her old life as a student. But her peace is short-lived. After a horrific murder, Sarah becomes the target of a relentless killer. Her investigation pulls her into the depths of a decades-old mystery involving the disappearance of a group of brilliant mathematicians—once poised to revolutionize their field. They called themselves The Dumat Society. From the author of The Ancient Code comes a new thriller for fans of Dan Brown, Michael Crichton, and mystery adventures. A stand-alone novel that also serves as a sequel to the Ex Libris series.
