HEISENBERG The Uncertainty Principle, Wyndham’s Theatre

Simon Stephens’s 90-minute two-hander is not about Heisenberg; but he uses his thesis that Nature is not predictable as a springboard. Two strangers, a lively 42-year-old American woman (Anne-Marie Duff) and a dry 75-year-old British man (Kenneth Cranham),who has done nothing with his life, have an encounter in a London railway station which develops into a relationship in which their intentions can never be precisely established. Nothing is inevitable until it happens. The chemistry between the actors is far more convincing than the chemistry between the people they are playing.