Malloy's fiesty landlady, Mrs. O'Brien, has her purse stolen and refuses to leave the station until her case is settled. O'Brien resorts to other means, including hounding detectives and setting up a picket line to vent her frustrations. Malloy deter... (more)mines that there may be a connection between O'Brien's theft and a string of purse snatchings involving Social Security checks, and suggests using a decoy to put an end to the heists, which works and the ring is brought down. Another incident involved two men arousing suspicion for their erratic behavior; in the ensuing pursuit the men are arrested and heroin is found in their car; later a call to a home where a man killed his son with a shovel, during the murder investigation they find candy wrappers and tire tracks that link with the two men arrested earlier.