Double Jeopardy plot
"A Deadly Formula For Murder!"
Emmett Devery is being blackmailed by his former partner, Sam Baggott, who spent several years in prison for a criminal transaction. Devery's daughter Barbara, who is in a relationship with his attorney Marc Hill, knows nothing about this blackmail. Baggott puts more pressure on the blackmail, but he is killed by Jeff Calder, the boyfriend of Baggott's adulterous wife Marge. Calder tried to outwit Baggott by blackmailing Marge because he wanted the money. However, the trail of Baggott's death leads the police to the innocent Devery. Devery admits that Baggott blackmailed him, but denies killing him. Hill and Barbara begin their own investigation.