Key To Murder

CBS Radio Mystery Theater "Key To Murder" is a Mystery from Friday, March 28, 1975.

Mrs. Rachel James fears she must sell her old brownstone house since two of her boarders have been found dead in their rooms—apparent suicides, the gas heaters turned on, the doors and windows locked from the inside. But the police, when they discover that each was unconscious before the gas asphyxiated them, suspect murder. Before he can make such a charge stick, however, Lt. Forbes must figure out how the murderer was able to lock the doors and windows from the inside.