A successful Wall Street trader returns to England with her new husband and five-year-old son, but their new start together turns into a nightmare when they move into a country house which contains a terrible secret.
Knife Edge is a 2009 British thriller film directed by Anthony Hickox and starring Natalie Press, Hugh Bonneville and Tamsin Egerton. It was the last film of Joan Plowright before her retirement in 2014 and death in 2025.