The power station for a four mile square area of town is destroyed in an explosion, and when a similar attack takes out the auxiliary generator at Police Headquarters, Ironside realises that somebody somewhere is trying to cover their tracks. The question is, who - and what is their goal?

On a day out with Mark, Ed finds a body in the park, but when Homicide arrives it has gone. Teased by his rival, Homicide Sergeant Larry Mullen, Ed is anxious to prove that there really was a body, but the Chief would rather have him working on a kidnapping case with the FBI. It soon appears, however, that the two cases may in fact be the same one.