When Joseph Mason of Groby Park, Yorkshire, died, he left his estate to his family. A codicil to his will, however, left Orley Farm, near London, to his much younger second wife and infant son. The will and the codicil were in her handwriting, and there were three witnesses, one of whom was no longer alive. A bitterly fought court case confirmed the codicil. Twenty years pass. Lady Mason lives at Orley Farm with her adult son, Lucius. Samuel Dockwrath, a tenant, is asked to leave by Lucius, who wants to try new intensive farming methods. Aggrieved, and knowing of the original case, Dockwrath investigates and finds a second deed signed by the same witnesses on the same date, though they can remember signing only one. He travels to Groby Park in Yorkshire, where Joseph Mason the younger lives with his comically parsimonious wife, and persuades Mason to have Lady Mason prosecuted for perjury. The prosecution fails, but Lady Mason later confesses privately that she committed the forgery, and is prompted by conscience to give up the estate.