The first episode of the season reveals that it was Diane whom Sam had called; his proposal was rejected because Diane thought he was on the rebound from Janet. After rejecting a number of other proposals during the season, Diane accepts Sam's proposal after a judge compelled him to propose once more. Diane's ex-fiance, Sumner Sloane, tells her one of his colleagues was impressed with her manuscript and forwarded it to a publisher. At their much-anticipated wedding, just before saying "I do" Sam and Diane receive the news that the publisher will give Diane a large advance to finish her book. They cancel the wedding, and Diane promises she will return in six months after finishing the book. Not knowing it is for the last time, Diane leaves Boston (and Cheers) behind.