Synopsis:
Proof, a story of a young girl (Catherine) who grieves over the loss of her father, a famous mathematician who had become a legend at the local university for solving complicated proofs, and for suffering from dementia. Just as Catherine begins to give in to her fear that she, too, might suffer from her father’s condition. Catherine older sister returns to straighten out their father's affair. Hal, one of the father’s old students, starts to poke around the house and discovers speckle-bound notebook that brings to light a buried family secret. It tests the sisters’ kinship as well as the romantic feelings growing between Catherine and Hal.