Suddenly, Last Summer is a one-act play

Play (theatre)

A play is a form of literature written by a playwright, usually consisting of scripted dialogue between characters, intended for theatrical performance rather than just reading. There are rare dramatists, notably George Bernard Shaw, who have had little preference whether their plays were performed...

 by Tennessee Williams

Tennessee Williams

Thomas Lanier "Tennessee" Williams III was an American writer who worked principally as a playwright in the American theater. He also wrote short stories, novels, poetry, essays, screenplays and a volume of memoirs...

. It opened off Broadway on January 7, 1958, as part of a double bill with another of Williams's one-acts, Something Unspoken. The presentation of the two plays was given the overall title Garden District, but Suddenly, Last Summer is now more often performed alone. The play, basically consisting of two long monologues, is considered one of Williams' starkest and most poetic works.
The play features Catharine Holly, a young woman who seems to go insane after her cousin Sebastian dies on a trip to Europe

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

 under mysterious circumstances.