In a tight, dramatic, two-character, two-act play Ted Allan, one of Canada's best-known playwrights, challenges us to think again about love and guilt, about madness and normalcy. My Sister's Keeper was first produced at the 1976 Lennoxville Festival in Quebec. (an earlier version, entitled 'I've Seen You Cut Lemons, ' had been directed by Sean Connery at the Fortune Theatre in London in 1970.) It is a play about sensitivity and about victims;...