Jessica Fletcher is attending a writer's conference at a historic mansion in the Berkshires, where her friends are hosting a murder-mystery party. As both crime-solver and mystery author, Jessica is an old hand at this kind of thing. So she swears to the Savoys that she won't reveal the secrets of their play and goes about enjoying the weekend with her colleagues. But when a young actor's murder scene appears all too real, no one can tell what's scripted and what isn't. They say the show must go on, but now everyone is wondering: Who really dunit?