Ironside S04 E17 The Target

"«The chief of detectives!»"

An ex-con determined to go straight is roped into a scam to steal dynamite, after his son is kidnapped. The Chief manages to get the boy back, but by then a bomb has already been planted, and there may be no time to stop it before it blows up. The Chief not only has to find the bomb, he also has to work out how to defuse it.