 Diana Reynolds (Whitney Blake) arrives at Perry Mason s office wearing a black eye she received in a scuffle with Tony Davis (Jan Merlin). She is interested in the welfare of the toddler son of Norma Carter (Phyllis Coates), daughter-in-law of tycoon Matthew Bartlett (R. G. Armstrong). Marian Shaw (Rachel Ames), Diana s former roommate, also concerned with Bartlett s grandson, is murdered at the Carter residence. Diana is charged with murder, and Perry has to walk gingerly through a mine field.