The sudden death of Mrs. Iris Edmund, wife of highly respected solicitor Major Edmund, is accepted as a heart attack until another similar illness in the same town causes a local doctor to suspect that she may have been poisoned.
George Mallaby
Det. Peter Barnes
Leonard Teale
Det. Sgt. David Mackay
Norman Yemm
Sen. Det. Jim Patterson
Alwyn Kurts
Insp. Colin Fox