AllMovie

The convicts in a maximum-security prison have developed a diabolically clever method to smuggle drugs in and out of the institution, using as their "mules" the prisoners' wives who show up on visiting day. When one of the convicts resists getting involved in the drug traffic, his wife on the "outside" is murdered in a laundromat. Hoping to rout the smugglers and prevent further murders, Stone (Karl Malden) and Keller (Michael Douglas) focus their investigation on convict's wife Rita King (Stefanie Powers)--who defiantly refuses to cooperate.