Granite-jawed Morris as Blackie meets old flame Savage, who tells him that her father, Baldwin, has just been released from prison and that he has hidden a sack of diamonds from an earlier robbery in a safe deposit box. She wants Baldwin to go straight and return the gems, asking Blackie to expedite matters; before the gumshoe can obtain the diamonds, he is arrested for Baldwin's murder. He escapes and discovers that Savage has been kidnaped by Kendall and his mob, who are holding her until she pinpoints the jewels. Blackie confronts the mob in Kendall's nightclub, shooting it out with several members and rounding up the rest while saving Savage. And, yes, our hero does return the jewels to their rightful owners.