In Proof by David Auburn, an enigmatic young woman, her manipulative sister, their brilliant father, and an unexpected suitor are all pieces of a puzzle within the search for the truth behind a mysterious mathematical proof. As the young woman begins to plan for the rest of her life on the eve of her 25th birthday, she struggles to solve the most perplexing problem of all: how much of her adored father’s genius (or madness) will she inherit?