Ain't Nobody's Business If I Do is the 11th episode of Season 5 on NBC series Frasier.

Synopsis Edit

MARSHA MASON RETURNS -- Frasier (Kelsey Grammer) and Niles (David Hyde Pierce) are unnerved by the thought of Sherry (guest star Marsha Mason) becoming their stepmother after learning that Daphne (Jane Leeves) accidentally discovered an engagement ring in Martin's (John Mahoney) drawer. Realizing very little is known about her, Niles secretly hires a detective to research her past.

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