Malloy's old landlady, Mrs. O'Brien, has her purse stolen and refuses to leave the station until her case is settled. Mrs. O'Brien resorts to other means, including hounding detectives and setting up a picket line to vent her frustrations. Malloy makes connection between her theft and a string of purse snatchings involving social security checks, and a decoy leads to the end of the theft ring. Calls include two suspicious men and a pursuit involving them, and a homicide where candy wrappers and tire tracks from the pursuit suspects are found.