O'Hara accompanies a diamond broker (Joseph Wiseman) to Africa to investigate his claim that he is a pawn in a smuggling scheme, however he has a suspicion that he is being set up.
Jessica Tandy stars as an elderly but peppery former Parisian artist's model who assists O'Hara in building his case of income tax evasion against a racketeer specializing in art swindles.
The ex-wife of a nightclub comic (Godfrey Cambridge) reports to O'Hara that her husband has arranged to deliver a bribe to an Internal Revenue Service man in return for the cancellation pf a scheduled IRS audit of his income.
O'Hara is approached by Laura Alpin who's the wife of mob racketeer Mike. Fed up with her husband's cheating on her she's ready to give evidence of his tax evasion. Mike decides to take measures to prevent his probable prison life.