Proof

Catherine has spent years caring for her brilliant but unstable father, Robert. When he dies she has more than grief to deal with: there’s her estranged sister, Claire, and Hal, a former student of her father’s who hopes to find valuable work in the 103 notebooks that Robert left behind. And a further problem: how much of her father’s madness - or genius - will Catherine inherit?

This Pulitzer Prize-winning play opened at the Donmar Warehouse in 2001.