The tempermental Frances Celane wants Mason to find a loophole in her father's will, which allows her inheritance to be given to charity should she marry before age 25. Her uncle Edward Norton, serving as trustee, refuses to budge from the letter of the will. Then Mason learns that his client is being blackmailed, and has not told him the whole truth. When Norton is murdered, Mason must pull off some fast footwork to keep his client from having to sulk in stripes.