Occupants of a London boarding house become suspects as a string of murders are discovered.

Blackie performs in a magic show at a women's prison, which gives an inmate an opportunity to escape.

Rancher Tim Clark borrows money from Bob Russell, who then rustles Clark's cattle so he will be unable to repay the money. Thus Russell is able to cheat Clark out of his ranch. Clark becomes a prospector for silver and ultimately comes to settle accounts with Russell and crooked deputy Bendix.

When Texas Grant rides into town people think the supposedly dead Jim Rawlins has returned. After a confrontation with Utah Becker, Grant learns Jim's wife, Helen, is about to lose her ranch to Becker, so he decides to stay and pose as Rawlins in an effort to help her.

Boston Blackie, in the 11th film of the Columbia series, indulges in some wit-trading with a squirmy spiritualist who deals in blackmail, murder and the occult. "Blackie" out to help his pal, "Runt," recover some jewels, finds himself involved in the homicides, and also finds himself as the prime suspect, and now has to find the real c...