Does genius equal madness? Do you inherit talent or insanity? Catherine has spent years caring for her brilliant but unstable father, a famous mathematician. Now, on the eve of his death, she must deal the arrival of her estranged sister, Claire; Hal, a former student of her father’s; and the discovery of a mysterious notebook. Proof is about family relationships and responsibilities, about love and guilt and vulnerability and trust and death and loss. It deals with the big issues, but it keeps them on a human scale and maintains a sense of humor in the process. It’s a play that you’ll remember and which will haunt you forever.