Detectives Lenny Briscoe and Ray Curtis investigate the death of a young quadriplegic boy, Michael Sutter, who was smothered in his bed at home. The detectives first suspect the boy's mother, Lois Sutter, who claims she was at home alone with the boy the afternoon he died. When they learn she was having a tryst with her dance instructor the afternoon her son died, she admits she'd left the boy with her daughter Stephanie. When they find hemlock in the dead boy's system, they think the father may have been responsible. With little evidence and no clear way forward, the detectives investigate one of the boy's physician, Dr. Lyle Semeko, whose patients seem to have a very high mortality rate.
—garykmcd