Before dying in prison for supposedly poisoning her husband fifteen years ago, Caroline Crale wrote her daughter Carla that she was clearly innocent. Carla believes her mother to be truthful and enlists the aid Justin Fogg, son of her mother's defense attorney. He had fallen in love with Caroline while observing her trial. They persuade those present on the day of the murder to return to the scene and enact their recollection of the events on the day Aymas Crale, painting Elsa his latest infatuation, is poisoned.

There are: Philip and Meredith Blake life long friends of the Crales; Elsa, now Lady Melksham; Angela Warren, Caroline's stepsister - a child then; Miss Williams Angela's governess; and Carla taking the place of her mother Caroline.

Justin proves beyond doubt that Caroline did not murder her husband at the same time revealing the guilty party.