The Twenty-Seven was a group that operated in the City of the Saved consisting of people, mostly musicians and other artists, who died at age 27.
Notable members include Kurt, Kristen, Amy and Nat Jaffe. Jane Dick was introduced to Kurt at one of the twenty-seven's parties and they began dating. (PROSE: About a Girl [+]Paul Dale Smith, Tales of the City (The City of the Saved, Obverse Books, 2012).)
Background information[]
The 27 club is an informal list of people from the real world who died at age 27.