Daphne finds an engagement ring in Martin's underwear drawer. Frasier and Niles are shaken at the idea of Sherry becoming their stepmother, but they agree that their father's happiness is most important to them. Soon afterwards, Sherry tells Martin that someone has been asking questions about her at McGinty's, and Martin immediately thinks his sons have hired a private investigator to check up on her. They deny it, but Frasier realizes that Niles is guilty and insists that he call off the investigation. He does this, but before departing the detective presents him with a half-finished report, which the brothers read and discover that Sherry has already been married six times. Sherry does not wish to marry ever again, but Martin does, and the two break up due to their incompatible expectations.