Finally getting to spend a bit of leave time with his latest flame, Barbara, Quincy heads off away from Los Angeles. They nearly get run off the road and then witness an accident. Quincy then finds himself in a life or death race to isolate a mysterious poison, found in the woman's body, that has already claimed two lives

Mr. & Mrs. Estes have baby twins and with Bill Estes working all day Madeline is finding it harder and harder to look after the two boys. One night one of the twins dies suddenly in its sleep. All the medical and police personnel involved thinks that the baby died from SID (Sudden Infant Death) Syndrome, but a new, young and ambitious ME, Dr. Gauge, thinks that it was battered and calls in Lt. Monahan.

Bill, remembering how his wife was getting angry with the workload of looking after both babies begins to think that she could have killed their son.