Maddie Hayes é uma ex-modelo de sucesso, mas, depois de levar um golpe de seu contador, acaba tendo quase todos os seus bens confiscados, exceto a agência de detetives Blue Moon - cuja existência ela desconhecia. Ela é obrigada a trabalhar lá ao lado de David Addisson, um detetive metido a engraçadinho e sedutor. As personalidades dos dois não batem e eles vivem brigando, mas a atração é inevitável.

Thirtysomething is an American television drama about a group of baby boomers in their late thirties. It was created by Marshall Herskovitz and Edward Zwick for MGM/UA Television Group and The Bedford Falls Company, and aired on ABC. It premiered in the U.S. on September 29, 1987. It lasted four seasons, with the last of its 85 episodes airing on May 28, 1991.

The title of the show was designed as thirtysomething by Kathie Broyles, who combined the words of the original title, Thirty Something.

In 1997, "The Go Between" and "Samurai Ad Man" were ranked #22 on TV Guide′s 100 Greatest Episodes of All Time.

In 2002, Thirtysomething was ranked #19 on TV Guide′s 50 Greatest TV Shows of All Time, and in 2013 TV Guide ranked it #10 in its list of The 60 Greatest Dramas of All Time.